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Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 3 — Jan. 31, 2011
  • pp: 2401–2409
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Wide bandwidth, low loss 1 by 4 wavelength division multiplexer on silicon for optical interconnects

D. T. H. Tan, K. Ikeda, S. Zamek, A. Mizrahi, M. P. Nezhad, A. V. Krishnamoorthy, K. Raj, J. E. Cunningham, X. Zheng, I. Shubin, Y. Luo, and Y. Fainman  »View Author Affiliations


Optics Express, Vol. 19, Issue 3, pp. 2401-2409 (2011)
http://dx.doi.org/10.1364/OE.19.002401


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Abstract

We demonstrate an add/drop filter based on coupled vertical gratings on silicon. Tailoring of the channel bandwidth and wavelength is experimentally demonstrated. The concept is extended to implement a 1 by 4 wavelength division multiplexer with 6nm channel separation, 3nm bandwidth, a flat top response with < 0.8dB ripple within the 3dB passband, 1dB insertion loss and 16dB crosstalk suppression. The device is ultracompact, having a footprint < 2 X 10−9m2.

© 2011 OSA

1. Introduction

Future advances in computer speeds are contingent on augmenting intra- and inter-chip bandwidth. Increases in power efficiency per bit of data is projected to be achieved by replacing electrical interconnects with their optical counterparts in the near future [1

1. A. V. Krishnamoorthy, R. Ho, X. Zheng, H. Schwetman, J. Lexau, P. Koka, G. Li, I. Shubin, and J. E. Cunningham, “Computing microsystems based on silicon photonic interconnects,” Proc. IEEE 97, 1337–1361 (2009). [CrossRef]

]. The implementation of photonic circuits for the purpose of chip-level communications requires devices such as modulators [2

2. G. T. Reed, G. Mashanovich, F. Y. Gardes, and D. J. Thomson, “Silicon optical modulators,” Nat. Photonics 4(8), 518–526 (2010). [CrossRef]

4

4. Q. Xu, B. Schmidt, J. Shakya, and M. Lipson, “Cascaded silicon micro-ring modulators for WDM optical interconnection,” Opt. Express 14(20), 9431–9435 (2006). [CrossRef] [PubMed]

], detectors [5

5. O. I. Dosunmu, D. D. Can, M. K. Emsley, L. C. Kimerling, and M. S. Unlu, “High-speed resonant cavity enhanced Ge photodetectors on reflecting Si substrates for 1550-nm operation,” IEEE Photon. Technol. Lett. 17(1), 175–177 (2005). [CrossRef]

7

7. H. Park, A. W. Fang, R. Jones, O. Cohen, O. Raday, M. N. Sysak, M. J. Paniccia, and J. E. Bowers, “A hybrid AlGaInAs-silicon evanescent waveguide photodetector,” Opt. Express 15(10), 6044–6052 (2007). [CrossRef] [PubMed]

] and wavelength division multiplexers (WDM) [8

8. P. D. Trinh, S. Yegnanarayanan, F. Coppinger, and B. Jalali, “Silicon-on-insulator (SOI) phased-array wavelength multi-demultiplexer with extremely low polarization sensitivity,” IEEE Photon. Technol. Lett. 9(7), 940–943 (1997). [CrossRef]

10

10. J. E. Cunningham, I. Shubin, X. Zheng, T. Pinguet, A. Mekis, Y. Luo, H. Thacker, G. Li, J. Yao, K. Raj, and A. V. Krishnamoorthy, “Highly-efficient thermally-tuned resonant optical filters,” Opt. Express 18(18), 19055–19063 (2010). [CrossRef] [PubMed]

]. In order to leverage the mature semiconductor fabrication infrastructure, implementation of optical interconnects on the ubiquitous silicon on insulator (SOI) platform is necessary. To date, most WDM developed for optical interconnects are based on ring resonator technology [9

9. F. Xia, M. Rooks, L. Sekaric, and Y. Vlasov, “Ultra-compact high order ring resonator filters using submicron silicon photonic wires for on-chip optical interconnects,” Opt. Express 15(19), 11934–11941 (2007). [CrossRef] [PubMed]

,10

10. J. E. Cunningham, I. Shubin, X. Zheng, T. Pinguet, A. Mekis, Y. Luo, H. Thacker, G. Li, J. Yao, K. Raj, and A. V. Krishnamoorthy, “Highly-efficient thermally-tuned resonant optical filters,” Opt. Express 18(18), 19055–19063 (2010). [CrossRef] [PubMed]

]. However, the drawback of ring resonators is their support of multiple resonant modes, giving rise to a limited free spectral range (FSR) of ~20nm. In the context of optical interconnects, this drawback implies that only a limited bandwidth may be utilized for transmission of data bits. In this paper, we demonstrate a highly compact, 1 by 4 wavelength division multiplexer (WDM) without the aforementioned limitations in bandwidth allocation. The achieved WDM has a flat channel response of < 0.8dB ripple, low insertion loss of 1dB and crosstalk suppression of 16dB. In addition, the large 3dB channel bandwidth of 3nm circumvents the need for active thermal tuning for wavelength stabilization, thus ensuring low power operation of the WDM. The demonstrated WDM is based on cascaded add/drop filters implemented using coupled vertical gratings. Tailoring of the bandwidth and operation wavelength of the constituent add/drop filters is also demonstrated.

2. Fabrication and characterization of coupled vertical grating add/drop filter

The add/drop filter forming the basis of the 1 by 4 WDM is based on coupled vertical gratings [11

11. K. Ikeda, M. Nezhad, and Y. Fainman, “Wavelength selective coupler with vertical gratings on silicon chip,” Appl. Phys. Lett. 92(20), 201111 (2008). [CrossRef]

16

16. D. T. H. Tan, P. C. Sun, and Y. Fainman, “Monolithic nonlinear pulse compressor on a silicon chip,” Nat Commun 1(8), 116 (2010). [CrossRef] [PubMed]

]. The schematic of the add/drop filter and a typical fabricated device are shown in Fig. 1(a)
Fig. 1 (a) Schematic of coupled vertical grating add/drop filter. (b) Scanning electron micrographs of a typical fabricated add/drop filter.
and 1(b) respectively. The add/drop filter is fully reciprocal, and is composed of two waveguide gratings, WG1 and WG2 with sinusoidally corrugated sidewalls, separated by a gap width, G. The average waveguide widths are denoted by W 1,2 and the sidewall modulation amplitudes are denoted by ΔW 1,2. The waveguide grating period, ΛB is identical in both gratings. The total filter length is denoted by L. In order to reduce out of band sidelobes, a raised cosine apodization filter is applied to modulate the coupling coefficient from zero at the extreme ends of the waveguides to its maximum value at the center. Optical fields at the add/drop filter wavelength of operation are incident at the input port and Bragg coupled into the drop port [11

11. K. Ikeda, M. Nezhad, and Y. Fainman, “Wavelength selective coupler with vertical gratings on silicon chip,” Appl. Phys. Lett. 92(20), 201111 (2008). [CrossRef]

]. Optical fields at all other wavelengths are transmitted unperturbed. The filter is implemented on a CMOS compatible SOI platform with a 250nm Si top layer on a 3μm buried oxide layer. The wavelength of operation, λB is governed by the equation [17

17. A. Yariv, and P. Yeh, Optical Waves in Crystals: Propagation and Control of Laser Radiation, (Wiley, New York, 2002).

,18

18. P. Yeh and H. F. Taylor, “Contradirectional frequency-selective couplers for guided-wave optics,” Appl. Opt. 19(16), 2848–2855 (1980). [CrossRef] [PubMed]

],
ΛB=λB/[neff1(λB)+neff2(λB)]
(1)
where neff 1,2 are the effective indices of WG1,2. Tailoring of the filter bandwidth, Δλ is achieved by varying G. A smaller value of G results in a larger overlap integral of the counter-propagating fields with the sidewall corrugation, leading to a larger filter bandwidth. In addition to Bragg cross coupling leading to the add/drop filter’s functionality as governed by Eq. (1), the sidewall corrugation on WG1 and WG2 lead to two additional Bragg conditions. The Bragg condition brought about by WG1 and WG2 places an upper and lower limit respectively on the free spectral range of the add/drop filter. The center wavelength, λFSR1,2 of the upper and lower limits are calculated using,
λFSR1,2=2.neff1,2(λFSR1,2).ΛB
(2)
Unlike add/drop filters implemented using ring resonators, the add/drop filter demonstrated here is not limited by its FSR, and therefore allows much more efficient bandwidth allocation within the C-band.

For demonstration of tailoring of the add/drop filter bandwidth, we utilize the following parameters. W 1 = 500nm and W 2 = 400nm, ΔW 1 = 50nm and ΔW 2 = 30nm. neff 1,2 for these values of W 1,2 are calculated using a fully vectorial, 3D beam propagation method. The calculated propagation constants provide a more accurate measure of the Bragg wavelengths as compared to prior work [11

11. K. Ikeda, M. Nezhad, and Y. Fainman, “Wavelength selective coupler with vertical gratings on silicon chip,” Appl. Phys. Lett. 92(20), 201111 (2008). [CrossRef]

], where the effective indices were calculated in 2D. It follows from Eq. (1) that for λB = 1.55μm, ΛB = 318nm. Using Eq. (2), λFSR1 is calculated to be centered at ~1.59μm and λFSR2 is calculated to be centered at ~1.51μm. Increasing the FSR limits may be achieved by increasing W 1 or decreasing W 2. In increasing the value of W 1, inverse tapers can be used to ensure that only the fundamental mode is excited [19

19. A. C. Turner, C. Manolatou, B. S. Schmidt, M. Lipson, M. A. Foster, J. E. Sharping, and A. L. Gaeta, “Tailored anomalous group-velocity dispersion in silicon channel waveguides,” Opt. Express 14(10), 4357–4362 (2006). [CrossRef] [PubMed]

]. The stop bands brought about by the Bragg conditions within WG1 and WG2 lead to a small reduction in the FSR. Using a cladding modulated Bragg grating implementation described in Ref. 20

20. D. T. H. Tan, K. Ikeda, and Y. Fainman, “Cladding-modulated Bragg gratings in silicon waveguides,” Opt. Lett. 34(9), 1357–1359 (2009). [CrossRef] [PubMed]

, weaker coupling coefficients within WG1 and WG2 may be implemented leading to smaller spectral bandwidths from self-Bragg coupling. This will enable the device FSR to be extended. Dispersion plots for 2β 1, 2β 2 and β 1 + β 2 are shown in Fig. 2
Fig. 2 Dispersion plots for 2β 1, 2β 2 and β 1 + β 2. Intersection points with 2π/Λ denote that the Bragg condition is satisfied, which gives rise to the add/drop filter’s FSR limits and channel wavelength.
, where β 1,2 are the propagation constants for WG1,2. The intersection points of each of the three plots with the horizontal dotted line, 2π/ΛB illustrate the three Bragg conditions leading to the FSR limits and the wavelength of operation of the add/drop filter.

Fabrication of the add/drop filters is performed using electron beam lithography, reactive ion etching followed by plasma enhanced chemical vapor deposition of the SiO2 overcladding. Propagation loss measured using the cutback method was 6dB/cm. Several add/drop filters with different values of G are fabricated in order to demonstrate tailoring of the filter bandwidth. All add/drop filters in this paper are terminated with inverse tapers in order to improve coupling efficiency and to minimize Fabry Perot oscillations in the measured spectra. The drop and transmission port spectra are measured using an optical spectrum analyzer with a broadband optical source adjusted for TE polarization as the input. Light from the broadband source is coupled via a tapered fiber into the add/drop filters for characterization. Figure 3(a)
Fig. 3 (a) – (c) Measured transmission (red) and drop port (blue) spectra for fabricated add/drop filters. (d) Plot of measured Δλ as a function of G showing the inverse exponential relation.
3(c) shows the measured add and transmission port spectra for G = 60nm, 104nm and 160nm for L = 400μm. The stopband observed in the transmission port at ~1585nm in each of the three plots is a result of the self-Bragg coupling of WG1, and agrees well with the value of λFSR1 calculated earlier. It is observed that the drop port wavelength is slightly red shifted to 1560nm. This observed shift is likely due to the fabricated value of W 2 being slightly larger than the design. The measured add/drop filter bandwidth is observed to decrease from 3nm to 1.9nm and 1.5nm as G is increased, as expected from the reduction in cross coupling strength. The reduction in coupling strength is also evident in the smaller amount of power coupled into the drop port for G = 160nm. Figure 3(d) shows a plot of the measured value of Δλ as G is varied showing the inverse exponential relation between the two parameters. The asymmetric shape observed in the measured spectra is a result of imperfect tapering of the coupling coefficients from the input of the filter to the center, and again from the center of the filter to the end. By optimizing the apodization filter, further reductions in the ripples observed at higher wavelengths may be achieved, thus reducing crosstalk levels.

The implementation of a wavelength division multiplexer requires that the channel wavelength may be tailored such that several add/drop filters with different spectral locations may be cascaded. According to Eq. (1), tailoring the filter wavelength may be achieved by changing W 2, so as to achieve a different value of neff 2 and consequently, λB. To demonstrate the feasibility of placing additional channels, we fabricated an additional device with a slightly different value of W2. To position the channel to the left of that demonstrated in Fig. 3(a), we require a smaller value of W2. According to Fig. 2, a reduction in neff2 by ~0.03 is necessary to shift the channel wavelength to 1.55μm. This may be achieved by decreasing W2 by ~20nm. A device with parameters L = 400μm, and G = 60nm with W2 20nm smaller than that of the device shown in Fig. 3(a). is fabricated. The measured drop port spectrum is plotted in Fig. 4
Fig. 4 Drop port measurements for G = 60nm for value of W2 20nm smaller (red dotted line) than that of the device shown in Fig. 3(a) (blue solid line). The channel wavelength has been red shifted by 12nm because of the smaller propagation constant in WG2.
together with the measured spectrum shown in Fig. 3(a). The expected shift in channel wavelength from the calculated effective indices of the waveguides and the cross coupling condition is 10nm. We obtain a measured shift in the drop port by 12nm from 1.56μm to 1.548μm. Additional channels can be similarly fabricated and accurately positioned by careful design of the width, W2.

3. Design and characterization of 1 by 4 WDM

Figure 6(a)
Fig. 6 (a) Measured spectral characteristics of 1 by 4 wavelength division multiplexer implemented using cascaded coupled vertical grating add/drop filters. (b) Enlarged plot of measured spectral characteristics of Port 4.
shows the measured spectra of drop ports 2 – 5 including the transmission port. The WDM spectra are normalized by the measured fiber-waveguide coupling. The demonstrated WDM has a low insertion loss of 1dB, a flat top response with < 0.8dB of ripple within the 3dB passband and 16dB inter-channel crosstalk suppression. Figure 6(b) plots an enlarged view of the measured spectrum from port 4. The flat top response will ensure that minimal amplitude distortion of data being transmitted through the channels occurs. The target design parameters of 3nm channel bandwidth and 6nm average channel separation are achieved. It is observed that the channel spacing is quite even, to an accuracy of 0.5nm. The demonstrated 1 by 4 WDM is ultracompact, having a total device footprint of (1.6μm X 950μm) < 2 X 10−9 m2.

Key advantages of the WDM implemented using coupled vertical grating add/drop filters are the large free spectral range, flat response and ultra-small footprint. High order ring resonators are widely used as wavelength filtering devices. State of the art ring resonator filters featuring large 3dB bandwidths of 2-3nm have high out of band rejection ratios of up to 40dB, but have a limited FSR of ~20nm [9

9. F. Xia, M. Rooks, L. Sekaric, and Y. Vlasov, “Ultra-compact high order ring resonator filters using submicron silicon photonic wires for on-chip optical interconnects,” Opt. Express 15(19), 11934–11941 (2007). [CrossRef] [PubMed]

]. Since the FSR of ring resonators scales inversely with the radius, decreasing the ring radius may offer larger FSRs, but at the cost of larger bending and coupling losses, and poor drop efficiency [21

21. P. Dumon, I. Christiaens, W. Bogaerts, V. Wiaux, J. Wouters, S. Beckx, D. Van Thourhout and R. Baets, “Microring resonators in Silicon-on-insulator,” in Proc. European Conf. on Integrated Optics, 196–199 (2005).

,22

22. A. M. Prabhu, A. Tsay, Z. Han, and V. Van, “Extreme Miniaturization of Silicon Add–Drop Microring Filters for VLSI Photonics Applications,” IEEE Photon. J. 2, 436–444 (2010). [CrossRef]

]. Arrayed waveguide gratings (AWGs) may be designed to have large FSRs exceeding 90nm [23

23. T. Fukazawa, F. Ohno, and T. Baba, “Very compact arrayed-waveguide-grating demultiplexer using Si photonic wire waveguides,” Jpn. J. Appl. Phys. 43(No. 5B), L673–L675 (2004). [CrossRef]

], but at the expense of a larger device footprint and inter-channel crosstalk. Our approach circumvents the limitation in the FSR, since each coupled grating add/drop filter has only one resonant wavelength. In order to further extend the useable bandwidth into the L-band, W 1 may be increased in order to red shift the self-Bragg coupling wavelength (1585nm) from WG1 and in so forth, obtain an even larger FSR. Consequently, wavelength division multiplexers with a larger number of channels may be implemented. However, the inter-channel crosstalk in our device falls short of that demonstrated in high order ring resonator filters [9

9. F. Xia, M. Rooks, L. Sekaric, and Y. Vlasov, “Ultra-compact high order ring resonator filters using submicron silicon photonic wires for on-chip optical interconnects,” Opt. Express 15(19), 11934–11941 (2007). [CrossRef] [PubMed]

]. Several approaches to improve the crosstalk may be taken. By increasing the sidewall modulation in WG1 and WG2, similar coupling coefficients and bandwidths may be obtained even with larger values of G. This approach will reduce some of the crosstalk induced by coupling of co-propagating modes between the two waveguides. In addition, further optimization of the apodization filter will enable reductions in sidelobe levels thus leading to an improvement in crosstalk. The inter-channel crosstalk suppression of 16dB achieved in our 1 by 4 WDM is close to the value of WDM components used in optical interconnects such as transceivers [24

24. T. Pinguet, B. Analui, E. Balmater, D. Guckenberger, M. Harrison, R. Koumans, D. Kucharski, Y. Liang, G. Masini, A. Mekis, S. Mirsaidi, A. Narasimha, M. Peterson, D. Rines, V. Sadagopan, S. Sahni, T. J. Sleboda, D. Song, Y. Wang, B. Welch, J. Witzens, J. Yao, S. Abdalla, S. Gloeckner, and P. De Dobbelaere, “Monolithically Integrated High-Speed CMOS Photonic Transceivers,” in Proc. IEEE conference on Group IV Photonics, 362–364, (2008).

].

4. Conclusions

Acknowledgments

This work was supported in part by the National Science Foundation, the Defense Advanced Research Projects Agency (DARPA), the NSF CIAN ERC, the Cymer corporation, and the U.S. Army Research Office. This work was also supported in part by Oracle under contract HR0011-08-9-0001 between the government and Oracle. The views, opinions and/or findings contained in this article are those of the author/presenter and should not be interpreted as representing the official views or policies, either expressed or implied, of the Defense Advanced Research Projects Agency or the Department of Defense. Distribution Statement “A” (Approved for Public Release, Distribution Unlimited). The authors thank the UCSB nanofabrication facility for help with electron beam writing.

References and links

1.

A. V. Krishnamoorthy, R. Ho, X. Zheng, H. Schwetman, J. Lexau, P. Koka, G. Li, I. Shubin, and J. E. Cunningham, “Computing microsystems based on silicon photonic interconnects,” Proc. IEEE 97, 1337–1361 (2009). [CrossRef]

2.

G. T. Reed, G. Mashanovich, F. Y. Gardes, and D. J. Thomson, “Silicon optical modulators,” Nat. Photonics 4(8), 518–526 (2010). [CrossRef]

3.

A. Liu, R. Jones, L. Liao, D. Samara-Rubio, D. Rubin, O. Cohen, R. Nicolaescu, and M. Paniccia, “A high-speed silicon optical modulator based on a metal-oxide-semiconductor capacitor,” Nature 427(6975), 615–618 (2004). [CrossRef] [PubMed]

4.

Q. Xu, B. Schmidt, J. Shakya, and M. Lipson, “Cascaded silicon micro-ring modulators for WDM optical interconnection,” Opt. Express 14(20), 9431–9435 (2006). [CrossRef] [PubMed]

5.

O. I. Dosunmu, D. D. Can, M. K. Emsley, L. C. Kimerling, and M. S. Unlu, “High-speed resonant cavity enhanced Ge photodetectors on reflecting Si substrates for 1550-nm operation,” IEEE Photon. Technol. Lett. 17(1), 175–177 (2005). [CrossRef]

6.

T. Pinguet, B. Analui, E. Balmater, D. Guckenberger, M. Harrison, R. Koumans, D. Kucharski, Y. Liang, G. Masini, A. Mekis, S. Mirsaidi, A. Narasimha, M. Peterson, D. Rines, V. Sadagopan, S. Sahni, T. J. Sleboda, D. Song, Y. Wang, B. Welch, J. Witzens, J. Yao, S. Abdalla, S. Gloeckner, and P. De Dobbelaere, “Monolithically integrated high-speed CMOS photonic transceivers,” Proc. IEEE conference on Group IV Photonics, 362–364 (2008).

7.

H. Park, A. W. Fang, R. Jones, O. Cohen, O. Raday, M. N. Sysak, M. J. Paniccia, and J. E. Bowers, “A hybrid AlGaInAs-silicon evanescent waveguide photodetector,” Opt. Express 15(10), 6044–6052 (2007). [CrossRef] [PubMed]

8.

P. D. Trinh, S. Yegnanarayanan, F. Coppinger, and B. Jalali, “Silicon-on-insulator (SOI) phased-array wavelength multi-demultiplexer with extremely low polarization sensitivity,” IEEE Photon. Technol. Lett. 9(7), 940–943 (1997). [CrossRef]

9.

F. Xia, M. Rooks, L. Sekaric, and Y. Vlasov, “Ultra-compact high order ring resonator filters using submicron silicon photonic wires for on-chip optical interconnects,” Opt. Express 15(19), 11934–11941 (2007). [CrossRef] [PubMed]

10.

J. E. Cunningham, I. Shubin, X. Zheng, T. Pinguet, A. Mekis, Y. Luo, H. Thacker, G. Li, J. Yao, K. Raj, and A. V. Krishnamoorthy, “Highly-efficient thermally-tuned resonant optical filters,” Opt. Express 18(18), 19055–19063 (2010). [CrossRef] [PubMed]

11.

K. Ikeda, M. Nezhad, and Y. Fainman, “Wavelength selective coupler with vertical gratings on silicon chip,” Appl. Phys. Lett. 92(20), 201111 (2008). [CrossRef]

12.

H. C. Kim, K. Ikeda, and Y. Fainman, “Tunable transmission resonant filter and modulator with vertical gratings,” J. Lightwave Technol. 25(5), 1147–1151 (2007). [CrossRef]

13.

J. Hastings, M. Lim, J. Goodberlet, and H. I. Smith, “Optical waveguides with apodized sidewall gratings via spatial-phase-locked electron-beam lithography,” J. Vac. Sci. Technol. B 20(6), 2753 (2002). [CrossRef]

14.

D. T. H. Tan, K. Ikeda, and Y. Fainman, “Coupled chirped vertical gratings for on chip group velocity dispersion engineering,” Appl. Phys. Lett. 95(14), 141109 (2009). [CrossRef]

15.

D. T. H. Tan, K. Ikeda, R. E. Saperstein, B. Slutsky, and Y. Fainman, “Chip-scale dispersion engineering using chirped vertical gratings,” Opt. Lett. 33(24), 3013–3015 (2008). [CrossRef] [PubMed]

16.

D. T. H. Tan, P. C. Sun, and Y. Fainman, “Monolithic nonlinear pulse compressor on a silicon chip,” Nat Commun 1(8), 116 (2010). [CrossRef] [PubMed]

17.

A. Yariv, and P. Yeh, Optical Waves in Crystals: Propagation and Control of Laser Radiation, (Wiley, New York, 2002).

18.

P. Yeh and H. F. Taylor, “Contradirectional frequency-selective couplers for guided-wave optics,” Appl. Opt. 19(16), 2848–2855 (1980). [CrossRef] [PubMed]

19.

A. C. Turner, C. Manolatou, B. S. Schmidt, M. Lipson, M. A. Foster, J. E. Sharping, and A. L. Gaeta, “Tailored anomalous group-velocity dispersion in silicon channel waveguides,” Opt. Express 14(10), 4357–4362 (2006). [CrossRef] [PubMed]

20.

D. T. H. Tan, K. Ikeda, and Y. Fainman, “Cladding-modulated Bragg gratings in silicon waveguides,” Opt. Lett. 34(9), 1357–1359 (2009). [CrossRef] [PubMed]

21.

P. Dumon, I. Christiaens, W. Bogaerts, V. Wiaux, J. Wouters, S. Beckx, D. Van Thourhout and R. Baets, “Microring resonators in Silicon-on-insulator,” in Proc. European Conf. on Integrated Optics, 196–199 (2005).

22.

A. M. Prabhu, A. Tsay, Z. Han, and V. Van, “Extreme Miniaturization of Silicon Add–Drop Microring Filters for VLSI Photonics Applications,” IEEE Photon. J. 2, 436–444 (2010). [CrossRef]

23.

T. Fukazawa, F. Ohno, and T. Baba, “Very compact arrayed-waveguide-grating demultiplexer using Si photonic wire waveguides,” Jpn. J. Appl. Phys. 43(No. 5B), L673–L675 (2004). [CrossRef]

24.

T. Pinguet, B. Analui, E. Balmater, D. Guckenberger, M. Harrison, R. Koumans, D. Kucharski, Y. Liang, G. Masini, A. Mekis, S. Mirsaidi, A. Narasimha, M. Peterson, D. Rines, V. Sadagopan, S. Sahni, T. J. Sleboda, D. Song, Y. Wang, B. Welch, J. Witzens, J. Yao, S. Abdalla, S. Gloeckner, and P. De Dobbelaere, “Monolithically Integrated High-Speed CMOS Photonic Transceivers,” in Proc. IEEE conference on Group IV Photonics, 362–364, (2008).

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Integrated Optics

History
Original Manuscript: December 1, 2010
Revised Manuscript: January 15, 2011
Manuscript Accepted: January 16, 2011
Published: January 25, 2011

Citation
D. T. H. Tan, K. Ikeda, S. Zamek, A. Mizrahi, M. P. Nezhad, A. V. Krishnamoorthy, K. Raj, J. E. Cunningham, X. Zheng, I. Shubin, Y. Luo, and Y. Fainman, "Wide bandwidth, low loss 1 by 4 wavelength division multiplexer on silicon for optical interconnects," Opt. Express 19, 2401-2409 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-3-2401


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References

  1. A. V. Krishnamoorthy, R. Ho, X. Zheng, H. Schwetman, J. Lexau, P. Koka, G. Li, I. Shubin, and J. E. Cunningham, “Computing microsystems based on silicon photonic interconnects,” Proc. IEEE 97, 1337–1361 (2009). [CrossRef]
  2. G. T. Reed, G. Mashanovich, F. Y. Gardes, and D. J. Thomson, “Silicon optical modulators,” Nat. Photonics 4(8), 518–526 (2010). [CrossRef]
  3. A. Liu, R. Jones, L. Liao, D. Samara-Rubio, D. Rubin, O. Cohen, R. Nicolaescu, and M. Paniccia, “A high-speed silicon optical modulator based on a metal-oxide-semiconductor capacitor,” Nature 427(6975), 615–618 (2004). [CrossRef] [PubMed]
  4. Q. Xu, B. Schmidt, J. Shakya, and M. Lipson, “Cascaded silicon micro-ring modulators for WDM optical interconnection,” Opt. Express 14(20), 9431–9435 (2006). [CrossRef] [PubMed]
  5. O. I. Dosunmu, D. D. Can, M. K. Emsley, L. C. Kimerling, and M. S. Unlu, “High-speed resonant cavity enhanced Ge photodetectors on reflecting Si substrates for 1550-nm operation,” IEEE Photon. Technol. Lett. 17(1), 175–177 (2005). [CrossRef]
  6. T. Pinguet, B. Analui, E. Balmater, D. Guckenberger, M. Harrison, R. Koumans, D. Kucharski, Y. Liang, G. Masini, A. Mekis, S. Mirsaidi, A. Narasimha, M. Peterson, D. Rines, V. Sadagopan, S. Sahni, T. J. Sleboda, D. Song, Y. Wang, B. Welch, J. Witzens, J. Yao, S. Abdalla, S. Gloeckner, and P. De Dobbelaere, “Monolithically integrated high-speed CMOS photonic transceivers,” Proc. IEEE conference on Group IV Photonics, 362–364 (2008).
  7. H. Park, A. W. Fang, R. Jones, O. Cohen, O. Raday, M. N. Sysak, M. J. Paniccia, and J. E. Bowers, “A hybrid AlGaInAs-silicon evanescent waveguide photodetector,” Opt. Express 15(10), 6044–6052 (2007). [CrossRef] [PubMed]
  8. P. D. Trinh, S. Yegnanarayanan, F. Coppinger, and B. Jalali, “Silicon-on-insulator (SOI) phased-array wavelength multi-demultiplexer with extremely low polarization sensitivity,” IEEE Photon. Technol. Lett. 9(7), 940–943 (1997). [CrossRef]
  9. F. Xia, M. Rooks, L. Sekaric, and Y. Vlasov, “Ultra-compact high order ring resonator filters using submicron silicon photonic wires for on-chip optical interconnects,” Opt. Express 15(19), 11934–11941 (2007). [CrossRef] [PubMed]
  10. J. E. Cunningham, I. Shubin, X. Zheng, T. Pinguet, A. Mekis, Y. Luo, H. Thacker, G. Li, J. Yao, K. Raj, and A. V. Krishnamoorthy, “Highly-efficient thermally-tuned resonant optical filters,” Opt. Express 18(18), 19055–19063 (2010). [CrossRef] [PubMed]
  11. K. Ikeda, M. Nezhad, and Y. Fainman, “Wavelength selective coupler with vertical gratings on silicon chip,” Appl. Phys. Lett. 92(20), 201111 (2008). [CrossRef]
  12. H. C. Kim, K. Ikeda, and Y. Fainman, “Tunable transmission resonant filter and modulator with vertical gratings,” J. Lightwave Technol. 25(5), 1147–1151 (2007). [CrossRef]
  13. J. Hastings, M. Lim, J. Goodberlet, and H. I. Smith, “Optical waveguides with apodized sidewall gratings via spatial-phase-locked electron-beam lithography,” J. Vac. Sci. Technol. B 20(6), 2753 (2002). [CrossRef]
  14. D. T. H. Tan, K. Ikeda, and Y. Fainman, “Coupled chirped vertical gratings for on chip group velocity dispersion engineering,” Appl. Phys. Lett. 95(14), 141109 (2009). [CrossRef]
  15. D. T. H. Tan, K. Ikeda, R. E. Saperstein, B. Slutsky, and Y. Fainman, “Chip-scale dispersion engineering using chirped vertical gratings,” Opt. Lett. 33(24), 3013–3015 (2008). [CrossRef] [PubMed]
  16. D. T. H. Tan, P. C. Sun, and Y. Fainman, “Monolithic nonlinear pulse compressor on a silicon chip,” Nat Commun 1(8), 116 (2010). [CrossRef] [PubMed]
  17. A. Yariv and P. Yeh, Optical Waves in Crystals: Propagation and Control of Laser Radiation, (Wiley, New York, 2002).
  18. P. Yeh and H. F. Taylor, “Contradirectional frequency-selective couplers for guided-wave optics,” Appl. Opt. 19(16), 2848–2855 (1980). [CrossRef] [PubMed]
  19. A. C. Turner, C. Manolatou, B. S. Schmidt, M. Lipson, M. A. Foster, J. E. Sharping, and A. L. Gaeta, “Tailored anomalous group-velocity dispersion in silicon channel waveguides,” Opt. Express 14(10), 4357–4362 (2006). [CrossRef] [PubMed]
  20. D. T. H. Tan, K. Ikeda, and Y. Fainman, “Cladding-modulated Bragg gratings in silicon waveguides,” Opt. Lett. 34(9), 1357–1359 (2009). [CrossRef] [PubMed]
  21. P. Dumon, I. Christiaens, W. Bogaerts, V. Wiaux, J. Wouters, S. Beckx, D. Van Thourhout and R. Baets, “Microring resonators in Silicon-on-insulator,” in Proc. European Conf. on Integrated Optics, 196–199 (2005).
  22. A. M. Prabhu, A. Tsay, Z. Han, and V. Van, “Extreme Miniaturization of Silicon Add–Drop Microring Filters for VLSI Photonics Applications,” IEEE Photon. J. 2, 436–444 (2010). [CrossRef]
  23. T. Fukazawa, F. Ohno, and T. Baba, “Very compact arrayed-waveguide-grating demultiplexer using Si photonic wire waveguides,” Jpn. J. Appl. Phys. 43(No. 5B), L673–L675 (2004). [CrossRef]
  24. T. Pinguet, B. Analui, E. Balmater, D. Guckenberger, M. Harrison, R. Koumans, D. Kucharski, Y. Liang, G. Masini, A. Mekis, S. Mirsaidi, A. Narasimha, M. Peterson, D. Rines, V. Sadagopan, S. Sahni, T. J. Sleboda, D. Song, Y. Wang, B. Welch, J. Witzens, J. Yao, S. Abdalla, S. Gloeckner, and P. De Dobbelaere, “Monolithically Integrated High-Speed CMOS Photonic Transceivers,” in Proc. IEEE conference on Group IV Photonics, 362–364, (2008).

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