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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 6 — Mar. 24, 2014
  • pp: 6822–6828
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Low-noise parametric frequency comb for continuous C-plus-L-band 16-QAM channels generation

Eduardo Temprana, Vahid Ataie, Bill P.-P. Kuo, Evgeny Myslivets, Nikola Alic, and Stojan Radic  »View Author Affiliations


Optics Express, Vol. 22, Issue 6, pp. 6822-6828 (2014)
http://dx.doi.org/10.1364/OE.22.006822


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Abstract

A low phase noise frequency comb generated from a continuous-wave seed is experimentally demonstrated across continuous C- and L-bands. Parametrically generated carriers with optical signal-to-noise ratio in excess of 45dB were used to generate 16-ary quadrature amplitude modulated signals. We characterize 20 GBaud channels’ performance that was varied by only 1.7 dB across the combined C/L band.

© 2014 Optical Society of America

1. Introduction

The importance of frequency combs has been recognized in both scientific and engineering applications [1

1. S. Diddams, “The evolving optical frequency comb,” J. Opt. Soc. Am. B 27(11), B51–B62 (2010). [CrossRef]

]. Apart from metrology [2

2. B. Sprenger, J. Zhang, Z. H. Lu, and L. J. Wang, “Atmospheric transfer of optical and radio frequency clock signals,” Opt. Lett. 34(7), 965–967 (2009). [CrossRef] [PubMed]

5

5. A. Bartels, D. Heinecke, and S. A. Diddams, “10-GHz self-referenced optical frequency comb,” Science 326(5953), 681 (2009). [CrossRef] [PubMed]

], optical frequency combs provide unique capability in sensing [6

6. R. Holzwarth, T. Udem, T. W. Hänsch, J. C. Knight, W. J. Wadsworth, and P. S. J. Russell, “Optical frequency synthesizer for precision spectroscopy,” Phys. Rev. Lett. 85(11), 2264–2267 (2000). [CrossRef] [PubMed]

, 7

7. A. Schliesser, M. Brehm, F. Keilmann, and D. van der Weide, “Frequency-comb infrared spectrometer for rapid, remote chemical sensing,” Opt. Express 13(22), 9029–9038 (2005). [CrossRef] [PubMed]

], astrophysics [8

8. F. Quinlan, G. Ycas, S. Osterman, and S. A. Diddams, “A 12.5 GHz-spaced optical frequency comb spanning >400 nm for near-infrared astronomical spectrograph calibration,” Rev. Sci. Instrum. 81(6), 063105 (2010). [CrossRef] [PubMed]

], as well as in arbitrary waveform generation [9

9. Z. Jiang, C.-B. Huang, D. E. Leaird, and A. M. Weiner, “Optical arbitrary waveform processing of more than 100 spectral comb lines,” Nat. Photonics 1(8), 463–467 (2007). [CrossRef]

, 10

10. N. K. Fontaine, D. J. Geisler, R. P. Scott, T. He, J. P. Heritage, and S. J. B. Yoo, “Demonstration of high-fidelity dynamic optical arbitrary waveform generation,” Opt. Express 18(22), 22988–22995 (2010). [CrossRef] [PubMed]

]. Although previously suggested for wavelength division multiplexed (WDM) transmission, successful demonstrations of comb-based transceivers have been scarce, and past reports particularly lacked the performance necessary for demonstration of high-cardinality modulation formats. Recognizing that WDM systems are at the core of high capacity information transfer [11

11. A. R. Chraplyvy, “The coming capacity crunch,” presented at the European Conference on Optical Communication 2009 (ECOC09), Vienna, Austria, 20–24September2009, plenary talk.

], it is necessary to develop frequency combs capable of supporting the modulation formats that are currently commonly realized with high performance single-frequency lasers.

In general, methods of comb generation rely on feedback mechanisms and/or nonlinear signal manipulation. The latter can be divided into techniques that rely on nonlinear modulation techniques (e.g. employing phase modulation) and nonlinear frequency mixing. The former frequency generation class encompasses combs derived from mode-locked lasers [12

12. S. T. Cundiff and J. Ye, “Colloquium: Femtosecond optical frequency combs,” Rev. Mod. Phys. 75(1), 325–342 (2003). [CrossRef]

14

14. A. Bartels, D. Heinecke, and S. A. Diddams, “Passively mode-locked 10 GHz femtosecond Ti:sapphire laser,” Opt. Lett. 33(16), 1905–1907 (2008). [CrossRef] [PubMed]

] as well as micro-cavities [15

15. T. J. Kippenberg, R. Holzwarth, and S. A. Diddams, “Microresonator-based optical frequency combs,” Science 332(6029), 555–559 (2011). [CrossRef] [PubMed]

17

17. J. Pfeifle, M. Lauermann, D. Wegner, J. Li, K. Hartinger, V. Brasch, T. Herr, D. Hillerkuss, R. M. Schmogrow, T. Schimmel, R. Holzwarth, T. J. Kippenberg, J. Leuthold, W. Freude, and C. Koos, “Microresonator-based frequency comb generator as optical source for coherent WDM transmission,” in Proc. OFC 2013 (2013), paper OW3C.2. [CrossRef]

]. A device intended for telecom application requires frequency adjustment, a property not shared by cavity-based approaches. Even in case when fixed frequency plan can be accepted, resonator-seeded combs impose strict optical signal to noise ratios (OSNRs) that is well below standard telecommunication lasers (40dB). On the other hand, modulation-based solutions [18

18. S. Fabbri, S. Sygletos, and A. Ellis, “Multi-harmonic optical comb generation,” in Proc. ECOC (2012), paper Mo.2.A.2.

23

23. R. Wu, V. R. Supradeepa, C. M. Long, D. E. Leaird, and A. M. Weiner, “Generation of very flat optical frequency combs from continuous-wave lasers using cascaded intensity and phase modulators driven by tailored radio frequency waveforms,” Opt. Lett. 35(19), 3234–3236 (2010). [CrossRef] [PubMed]

] are characterized by frequency agility and are free from cavity imposed restrictions. This class of generator, however, is restricted in spectral span by E/O modulation bandwidth, and signal-to-noise ratio due to modulation loss. As a consequence of performance deficiency, there has been limited success in adopting frequency combs in high-capacity coherent communications. Prior demonstrations had either limited spectral coverage [17

17. J. Pfeifle, M. Lauermann, D. Wegner, J. Li, K. Hartinger, V. Brasch, T. Herr, D. Hillerkuss, R. M. Schmogrow, T. Schimmel, R. Holzwarth, T. J. Kippenberg, J. Leuthold, W. Freude, and C. Koos, “Microresonator-based frequency comb generator as optical source for coherent WDM transmission,” in Proc. OFC 2013 (2013), paper OW3C.2. [CrossRef]

], or were restricted to simple modulation formats due to unmanageable carrier noise [18

18. S. Fabbri, S. Sygletos, and A. Ellis, “Multi-harmonic optical comb generation,” in Proc. ECOC (2012), paper Mo.2.A.2.

].

In contrast, parametric combs combine the three key properties: the generation mechanism is cavity-free, unrestricted by E/O conversion, and includes distributed gain mechanism allowing for an efficient, yet band-flexible frequency generation. Indeed, parametric combs have been demonstrably capable of spanning nearly octave bandwidths in pulsed operation [24

24. J. M. Chavez Boggio, S. Moro, N. Alic, S. Radic, M. Karlsson, and J. Bland-Hawthorn, “Nearly octave-spanning cascaded four-wave-mixing generation in low dispersion highly nonlinear fiber” in Proc. ECOC2009 (2009), paper 9.1.2.

], and/or covering the entire 1525-1620nm telecom band in continuous-mode operation, while maintaining high OSNRs [25

25. B. P.-P. Kuo, E. Myslivets, N. Alic, and S. Radic, “Wavelength multicasting via frequency comb generation in a bandwidth-enhanced fiber optical parametric mixer,” J. Lightwave Technol. 29(23), 3515–3522 (2011). [CrossRef]

30

30. A. H. Gnauck, B. P.-P. Kuo, E. Myslivets, R. M. Jopson, M. Dinu, J. E. Simsarian, P. J. Winzer, and S. Radic, “Comb-based 16-QAM transmitter spanning the C and L bands,” to appear in IEEE Photon. Technol. Lett.

]. However, preliminary report on the performance of higher-order coherent channels carried by parametric comb revealed significant noise aggregation towards the outer edges of the comb spectral span, thus resulting in sensitivity penalty up to 9 dB [30

30. A. H. Gnauck, B. P.-P. Kuo, E. Myslivets, R. M. Jopson, M. Dinu, J. E. Simsarian, P. J. Winzer, and S. Radic, “Comb-based 16-QAM transmitter spanning the C and L bands,” to appear in IEEE Photon. Technol. Lett.

]. This report describes the characteristics of a new frequency comb that significantly reduced noise aggregation. The key to noise suppression in this work was precision dispersion management in the parametric mixer that reduces excessive nonlinear noise coupling. Consequently, we demonstrate 20 GBaud 16QAM generation and detection using 100-GHz pitched parametric frequency comb covering the entire C- and L-bands. The quality of this coherent, multi-tone signal generator was quantified by measuring bit-error-ratios to find maximal variation of 1.7 dB in performance quality over the entire operational band.

2. Advanced design parametric comb phase noise distribution

Taking into account of practical considerations imposed on a coherent lightwave link, a respective candidate source must satisfy a number of highly demanding requirements. Firstly, the source must provide narrow and sufficiently stable carrier linewidth, defined by the complexity of the modulation format as well as the transmitted symbol rate [31

31. T. Pfau, S. Hoffmann, and R. Noe, “Hardware-efficient coherent digital receiver concept with feedforward carrier recovery for M-QAM constellations,” J. Lightwave Technol. 27(8), 989–999 (2009). [CrossRef]

]. Secondly, the signal integrity generation at the transmit side mandates sources with high output power as well as high OSNR, simplifying the transceiver implementation and ultimately enabling longer reach [27

27. B. P.-P. Kuo, E. Myslivets, V. Ataie, E. G. Temprana, N. Alic, and S. Radic, “Wideband parametric frequency comb as coherent optical carrier,” J. Lightwave Technol. 31(21), 3414–3419 (2013). [CrossRef]

]. To date, only few comb implementations have jointly fulfilled all of the above requirements.

In particular, the phase stability of each constituent frequency tone plays a critical role in evaluating the comb source compatibility with higher order (coherent) modulation formats. Furthermore, in terms of maintaining the phase stability across the complete emission spectrum, frequency combs represent a particularly challenging construct. Indeed, frequency combs generated via a nonlinear action, regardless of the original seeding mechanism, are inherently characterized by phase noise increase with the comb tone order. The latter property is a consequence of the seed emission phase uncertainty, preventing a penalty-free frequency generation. In this respect, traveling parametric mixers offer the most accessible platform for phase noise inhibition since they provide access to frequency tones with hundreds of lines [27

27. B. P.-P. Kuo, E. Myslivets, V. Ataie, E. G. Temprana, N. Alic, and S. Radic, “Wideband parametric frequency comb as coherent optical carrier,” J. Lightwave Technol. 31(21), 3414–3419 (2013). [CrossRef]

, 28

28. V. Ataie, B. P.-P. Kuo, E. Myslivets, and S. Radic, “Generation of 1500-tone, 120nm-wide ultraflat frequency comb by single CW source,” in Proc. OFC2013 (2013), paper PDP5C.1. [CrossRef]

] while preventing resonant (higher-order) mixing processes from occurring. Recent development of shock-wave mixer (SWM) design has relied on such generation mechanism [25

25. B. P.-P. Kuo, E. Myslivets, N. Alic, and S. Radic, “Wavelength multicasting via frequency comb generation in a bandwidth-enhanced fiber optical parametric mixer,” J. Lightwave Technol. 29(23), 3515–3522 (2011). [CrossRef]

28

28. V. Ataie, B. P.-P. Kuo, E. Myslivets, and S. Radic, “Generation of 1500-tone, 120nm-wide ultraflat frequency comb by single CW source,” in Proc. OFC2013 (2013), paper PDP5C.1. [CrossRef]

], allowing scaled, high-OSNR frequency generation. However, early demonstrations of SWM-based combs were not aimed at increased phase stability and suffered from a considerable deterioration of the phase integrity with the ascending line order (i.e from the comb center and towards the spectral edges). In contrast to mixers aided by resonant mechanism, the SWM mixer does not need to operate in highly anomalous regime. With distributed dispersion engineering, the parametric mixer can suppress excess noise even in the absence of spectral confinement simply by alternating regions with anomalous and normal dispersion. A three-stage parametric SWM comb generator, engineered to produce carriers with OSNR in excess of 45dB was constructed and used in the measurements, as shown in Fig. 1.
Fig. 1 A three-stage shock-wave mixer-based comb generation schematic.

3. Experimental results: comb-based quadrature amplitude modulation performance characterization

The wide-band comb qualification for coherent transmission was validated for a 20 GBaud 16QAM modulation format. The modulation format was chosen so as to specifically investigate the phase integrity of the generated multi-wavelength source. The corresponding experimental setup is shown in Fig. 5.
Fig. 5 BER characterization experimental schematic; Acronyms: BPF – band-pass filter; QAM – quadrature amplitude modulation; AWG – arbitrary waveform generator; ASE – amplified spontaneous emission; VOA – variable optical attenuator; PC – personal computer.

A comb line under test was extracted by a cascade of filters and was used as a carrier for QAM modulation. An arbitrary waveform generator was used for 20 GBaud multi-level signal generation. The 16 QAM modulation was imprinted onto the carrier with a 28GHz nested Mach-Zehnder modulator, whereas the generated signal was amplified to 10 dBm ensuring performance characterization unimpeded by the receiver thermal noise. The thus generated signal was noise loaded and filtered by a 0.6nm optical band pass filter, whereas an amplified 100kHz external cavity laser (ECL) was used as a local oscillator in a standard (single polarization) intra-dyne [34

34. M. G. Taylor, “Coherent detection method using DSP for demodulation of signal and subsequent equalization of propagation impairments,” IEEE Photonics Technol. Lett. 16(2), 674–676 (2004). [CrossRef]

,35

35. S. J. Savory, G. Gavioli, R. I. Killey, and P. Bayvel, “Electronic compensation of chromatic dispersion using a digital coherent receiver,” Opt. Express 15(5), 2120–2126 (2007). [CrossRef] [PubMed]

] detection arrangement. The intra-dyne signal was captured on a real-time oscilloscope, with digital signal processing having been performed on a personal computer (PC). The PC-controlled setup perfectly emulates the bit-error-ratio testing (BERT) system with off-line processing. The digital signal processing (DSP) procedures encompassed standard LO frequency offset removal, the maximum likelihood carrier phase recovery [36

36. I. Fatadin and S. J. Savory, “Compensation of frequency offset for 16-QAM optical coherent systems using QPSK partitioning,” IEEE Photonics Technol. Lett. 23(17), 1246–1248 (2011).

], as well as symbol detection. The BERs measurements were performed for a 215 de-Brujin sequence (with appropriately delayed regular and inverted waveforms generating the 16QAM signal stream in two quadratures of the electric field)and for a range of OSNRs. In the characterization, one out of every five lines across the comb emission spectrum had been subject to testing. The smooth ascending phase noise characteristic (see Fig. 4) fully justifies the adopted reduced set characterization approach. The BER measurement results are shown in Fig. 6.
Fig. 6 20 Gbaud 16QAM BER performance. (left) C-band; (right) L-band.
A total deviation of 1.7 dB in the OSNR penalty was recorded in C and L bands, respectively. We note that different sets of amplifiers and filters were used in the characterizations in the two bands, owing to their respective underlying band-specific limitations. A set of 40 GHz discrete balanced detectors and hybrids were used in the two bands, of which we note that a nominal 1 dB performance difference (in favor of the C-band receivers) was rigorously established prior to the experiment, the consequence of which is recognized by a 1dB performance offset observed between the results in C- and L-bands, shown in Fig. 6.

Figure 7 shows a comparative performance throughout the comb emission spectrum as the OSNR (with the noise power level measured in a 0.1nm bandwidth) required to reach the BER level of 10−3.
Fig. 7 Receiver Sensitivity at BER = 10−3 against carrier wavelength.
In both transmission bands, we observe only a minor performance deterioration towards the edges of the spectrum (i.e. from the center of the comb towards the outliers in either direction), as expected from the direct phase noise characterization results (see Fig. 4). As implied before, the measurable loss of performance within outer comb emission boundaries is a consequence of the spectral tone linewidth increase originating in non-ideal seed-seed generation and intra-mixer noise accumulation. While measurable, this penalty was negligible when measured with 16QAM modulation. Specifically, the measured sensitivity at BER = 10−3 varied less than 1.7 dB throughout the entire C/L band and represents the smallest phase stability excursion measured to date for optical frequency combs spanning the telecom band. While the increased phase variation toward the edge of the C/L band contributed to the penalty variation, we have also observed the variance in receiver components performance, whereas the two contributions were not separable at the time of the measurement.

4. Conclusion

We report the characterization of 20 GBaud 16-QAM signal generation based on high-OSNR, low-noise frequency comb source encompassing contiguous C- and L- telecom bands. A noise-managed shock-wave parametric mixer was constructed to achieve low phase noise in the 100-GHz spaced comb spanning 8.75 THz. The carrier fidelity was characterized by direct phase noise characterization, as well as the BER measurements of a 16QAM signal. While the phase error variance increased towards the spectral edges, the penalty associated with this effect was limited to only a 1.7dB penalty variation across the entire C/L band. As a consequence, the results provide a strong argument for the use of CW-diode derived optical frequency combs as a scalable carrier solution in high-capacity lightwave coherent links.

References and links

1.

S. Diddams, “The evolving optical frequency comb,” J. Opt. Soc. Am. B 27(11), B51–B62 (2010). [CrossRef]

2.

B. Sprenger, J. Zhang, Z. H. Lu, and L. J. Wang, “Atmospheric transfer of optical and radio frequency clock signals,” Opt. Lett. 34(7), 965–967 (2009). [CrossRef] [PubMed]

3.

H. Inaba, Y. Daimon, F.-L. Hong, A. Onae, K. Minoshima, T. R. Schibli, H. Matsumoto, M. Hirano, T. Okuno, M. Onishi, and M. Nakazawa, “Long-term measurement of optical frequencies using a simple, robust and low-noise fiber based frequency comb,” Opt. Express 14(12), 5223–5231 (2006). [CrossRef] [PubMed]

4.

P. Balling, P. Křen, P. Mašika, and S. A. van den Berg, “Femtosecond frequency comb based distance measurement in air,” Opt. Express 17(11), 9300–9313 (2009). [CrossRef] [PubMed]

5.

A. Bartels, D. Heinecke, and S. A. Diddams, “10-GHz self-referenced optical frequency comb,” Science 326(5953), 681 (2009). [CrossRef] [PubMed]

6.

R. Holzwarth, T. Udem, T. W. Hänsch, J. C. Knight, W. J. Wadsworth, and P. S. J. Russell, “Optical frequency synthesizer for precision spectroscopy,” Phys. Rev. Lett. 85(11), 2264–2267 (2000). [CrossRef] [PubMed]

7.

A. Schliesser, M. Brehm, F. Keilmann, and D. van der Weide, “Frequency-comb infrared spectrometer for rapid, remote chemical sensing,” Opt. Express 13(22), 9029–9038 (2005). [CrossRef] [PubMed]

8.

F. Quinlan, G. Ycas, S. Osterman, and S. A. Diddams, “A 12.5 GHz-spaced optical frequency comb spanning >400 nm for near-infrared astronomical spectrograph calibration,” Rev. Sci. Instrum. 81(6), 063105 (2010). [CrossRef] [PubMed]

9.

Z. Jiang, C.-B. Huang, D. E. Leaird, and A. M. Weiner, “Optical arbitrary waveform processing of more than 100 spectral comb lines,” Nat. Photonics 1(8), 463–467 (2007). [CrossRef]

10.

N. K. Fontaine, D. J. Geisler, R. P. Scott, T. He, J. P. Heritage, and S. J. B. Yoo, “Demonstration of high-fidelity dynamic optical arbitrary waveform generation,” Opt. Express 18(22), 22988–22995 (2010). [CrossRef] [PubMed]

11.

A. R. Chraplyvy, “The coming capacity crunch,” presented at the European Conference on Optical Communication 2009 (ECOC09), Vienna, Austria, 20–24September2009, plenary talk.

12.

S. T. Cundiff and J. Ye, “Colloquium: Femtosecond optical frequency combs,” Rev. Mod. Phys. 75(1), 325–342 (2003). [CrossRef]

13.

N. R. Newbury and W. C. Swann, “Low-noise fiber-laser frequency combs,” J. Opt. Soc. Am. B 24(8), 1756–1770 (2007). [CrossRef]

14.

A. Bartels, D. Heinecke, and S. A. Diddams, “Passively mode-locked 10 GHz femtosecond Ti:sapphire laser,” Opt. Lett. 33(16), 1905–1907 (2008). [CrossRef] [PubMed]

15.

T. J. Kippenberg, R. Holzwarth, and S. A. Diddams, “Microresonator-based optical frequency combs,” Science 332(6029), 555–559 (2011). [CrossRef] [PubMed]

16.

P. Del’Haye, O. Arcizet, A. Schliesser, R. Holzwarth, and T. J. Kippenberg, “Full stabilization of a microresonator-based optical frequency comb,” Phys. Rev. Lett. 101(5), 053903 (2008). [CrossRef] [PubMed]

17.

J. Pfeifle, M. Lauermann, D. Wegner, J. Li, K. Hartinger, V. Brasch, T. Herr, D. Hillerkuss, R. M. Schmogrow, T. Schimmel, R. Holzwarth, T. J. Kippenberg, J. Leuthold, W. Freude, and C. Koos, “Microresonator-based frequency comb generator as optical source for coherent WDM transmission,” in Proc. OFC 2013 (2013), paper OW3C.2. [CrossRef]

18.

S. Fabbri, S. Sygletos, and A. Ellis, “Multi-harmonic optical comb generation,” in Proc. ECOC (2012), paper Mo.2.A.2.

19.

R. Maher, K. Shi, L. P. Barry, J. O’Carroll, B. Kelly, R. Phelan, J. O’Gorman, and P. M. Anandarajah, “Implementation of a cost-effective optical comb source in a WDM-PON with 10.7 Gb/s data to each ONU and 50 km reach,” Opt. Express 18(15), 15672–15681 (2010). [CrossRef] [PubMed]

20.

J. Pfeifle, C. Weimann, F. Bach, J. Riemensberger, K. Hartinger, D. Hillerkuss, M. Jordan, R. Holtzwarth, T. J. Kippenberg, J. Leuthold, W. Freude, and C. Koos, “Microresonator-based optical frequency combs for high-bitrate WDM data transmission,” in Proc. OFC/NFOEC 2012 (2012), paper OW1C.4. [CrossRef]

21.

L. Barry, R. Watts, E. Martin, C. Browning, K. Merghem, C. Calò, A. Martinez, R. Rosales, and A. Ramdane, “Characterization of optical frequency combs for OFDM based optical transmission systems,” in Proc. International Conference on Fibre Optics and Photonics (2012), paper W2A.2. [CrossRef]

22.

Y. Wang, N. Chi, J. Zhang, and S. Zou, “Investigation on the generation of coherent optical multi-carriers using cascaded phase modulators,” Proc. SPIE 8309, 83090R (2011). [CrossRef]

23.

R. Wu, V. R. Supradeepa, C. M. Long, D. E. Leaird, and A. M. Weiner, “Generation of very flat optical frequency combs from continuous-wave lasers using cascaded intensity and phase modulators driven by tailored radio frequency waveforms,” Opt. Lett. 35(19), 3234–3236 (2010). [CrossRef] [PubMed]

24.

J. M. Chavez Boggio, S. Moro, N. Alic, S. Radic, M. Karlsson, and J. Bland-Hawthorn, “Nearly octave-spanning cascaded four-wave-mixing generation in low dispersion highly nonlinear fiber” in Proc. ECOC2009 (2009), paper 9.1.2.

25.

B. P.-P. Kuo, E. Myslivets, N. Alic, and S. Radic, “Wavelength multicasting via frequency comb generation in a bandwidth-enhanced fiber optical parametric mixer,” J. Lightwave Technol. 29(23), 3515–3522 (2011). [CrossRef]

26.

E. Myslivets, B. P. P. Kuo, N. Alic, and S. Radic, “Generation of wideband frequency combs by continuous-wave seeding of multistage mixers with synthesized dispersion,” Opt. Express 20(3), 3331–3344 (2012). [CrossRef] [PubMed]

27.

B. P.-P. Kuo, E. Myslivets, V. Ataie, E. G. Temprana, N. Alic, and S. Radic, “Wideband parametric frequency comb as coherent optical carrier,” J. Lightwave Technol. 31(21), 3414–3419 (2013). [CrossRef]

28.

V. Ataie, B. P.-P. Kuo, E. Myslivets, and S. Radic, “Generation of 1500-tone, 120nm-wide ultraflat frequency comb by single CW source,” in Proc. OFC2013 (2013), paper PDP5C.1. [CrossRef]

29.

Z. Tong, A. O. J. Wiberg, E. Myslivets, B. P. P. Kuo, N. Alic, and S. Radic, “Spectral linewidth preservation in parametric frequency combs seeded by dual pumps,” Opt. Express 20(16), 17610–17619 (2012). [CrossRef] [PubMed]

30.

A. H. Gnauck, B. P.-P. Kuo, E. Myslivets, R. M. Jopson, M. Dinu, J. E. Simsarian, P. J. Winzer, and S. Radic, “Comb-based 16-QAM transmitter spanning the C and L bands,” to appear in IEEE Photon. Technol. Lett.

31.

T. Pfau, S. Hoffmann, and R. Noe, “Hardware-efficient coherent digital receiver concept with feedforward carrier recovery for M-QAM constellations,” J. Lightwave Technol. 27(8), 989–999 (2009). [CrossRef]

32.

Z. Tong, A. O. J. Wiberg, E. Myslivets, B. P.-P. Kuo, N. Alic, and S. Radic, “Spectral linewidth preservation in parametric frequency combs seeded by dual pumps,” Opt. Express 20(16), 17610–17619 (2012). [CrossRef] [PubMed]

33.

E. Ip, A. P. T. Lau, D. J. F. Barros, and J. M. Kahn, “Coherent detection in optical fiber systems,” Opt. Express 16(2), 753–791 (2008). [CrossRef] [PubMed]

34.

M. G. Taylor, “Coherent detection method using DSP for demodulation of signal and subsequent equalization of propagation impairments,” IEEE Photonics Technol. Lett. 16(2), 674–676 (2004). [CrossRef]

35.

S. J. Savory, G. Gavioli, R. I. Killey, and P. Bayvel, “Electronic compensation of chromatic dispersion using a digital coherent receiver,” Opt. Express 15(5), 2120–2126 (2007). [CrossRef] [PubMed]

36.

I. Fatadin and S. J. Savory, “Compensation of frequency offset for 16-QAM optical coherent systems using QPSK partitioning,” IEEE Photonics Technol. Lett. 23(17), 1246–1248 (2011).

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes

ToC Category:
Optical Communications

History
Original Manuscript: January 2, 2014
Revised Manuscript: March 3, 2014
Manuscript Accepted: March 3, 2014
Published: March 17, 2014

Citation
Eduardo Temprana, Vahid Ataie, Bill P.-P. Kuo, Evgeny Myslivets, Nikola Alic, and Stojan Radic, "Low-noise parametric frequency comb for continuous C-plus-L-band 16-QAM channels generation," Opt. Express 22, 6822-6828 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-6-6822


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References

  1. S. Diddams, “The evolving optical frequency comb,” J. Opt. Soc. Am. B 27(11), B51–B62 (2010). [CrossRef]
  2. B. Sprenger, J. Zhang, Z. H. Lu, L. J. Wang, “Atmospheric transfer of optical and radio frequency clock signals,” Opt. Lett. 34(7), 965–967 (2009). [CrossRef] [PubMed]
  3. H. Inaba, Y. Daimon, F.-L. Hong, A. Onae, K. Minoshima, T. R. Schibli, H. Matsumoto, M. Hirano, T. Okuno, M. Onishi, M. Nakazawa, “Long-term measurement of optical frequencies using a simple, robust and low-noise fiber based frequency comb,” Opt. Express 14(12), 5223–5231 (2006). [CrossRef] [PubMed]
  4. P. Balling, P. Křen, P. Mašika, S. A. van den Berg, “Femtosecond frequency comb based distance measurement in air,” Opt. Express 17(11), 9300–9313 (2009). [CrossRef] [PubMed]
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