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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 21 — Oct. 8, 2012
  • pp: 23367–23373
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Switchable dual-wavelength SOA-based fiber laser with continuous tunability over the C-band at room-temperature

M. A. Ummy, N. Madamopoulos, M. Razani, A. Hossain, and R. Dorsinville  »View Author Affiliations


Optics Express, Vol. 20, Issue 21, pp. 23367-23373 (2012)
http://dx.doi.org/10.1364/OE.20.023367


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Abstract

We propose and demonstrate a simple compact, inexpensive, SOA-based, dual-wavelength tunable fiber laser, that can potentially be used for photoconductive mixing and generation of waves in the microwave and THz regions. A C-band semiconductor optical amplifier (SOA) is placed inside a linear cavity with two Sagnac loop mirrors at its either ends, which act as both reflectors and output ports. The selectivity of dual wavelengths and the tunability of the wavelength difference (Δλ) between them is accomplished by placing a narrow bandwidth (e.g., 0.3 nm) tunable thin film-based filter and a fiber Bragg grating (with bandwidth 0.28 nm) inside the loop mirror that operates as the output port. A total output power of + 6.9 dBm for the two wavelengths is measured and the potential for higher output powers is discussed. Optical power and wavelength stability are measured at 0.33 dB and 0.014 nm, respectively.

© 2012 OSA

1. Introduction

Single or multi-wavelength fiber lasers [1

1. Y. W. Lee, J. Jung, and B. Lee, “Multiwavelength-switchable SOA-fiber ring laser based on polarization-maintaining fiber loop mirror and polarization beam splitter,” IEEE Photon. Technol. Lett. 16(1), 54–56 (2004). [CrossRef]

5

5. M. A. Ummy, N. Madamopoulos, P. Lama, and R. Dorsinville, “Dual Sagnac loop mirror SOA-based widely tunable dual-output port fiber laser,” Opt. Express 17(17), 14495–145001 (2009). [CrossRef] [PubMed]

] have attracted considerable research interest in recent years due to their applicability in optical communications, optical instrument and fiber sensors [6

6. N. J. C. Libatique and R. K. Jain, “Precisely and rapidly wavelength-switchable narrow-linewidth 1.5μm laser source for wavelength division multiplexing applications,” IEEE Photon. Technol. Lett. 11(12), 1584–1586 (1999). [CrossRef]

8

8. Z. Chen, S. Ma, and N. K. Dutta, “Stable dual wavelength mode-locked Erbium-doped fiber ring laser,” in Frontiers in Optics, OSA Technical Digest, paper FTuG6.

]. Moreover, a switchable dual wavelength fiber laser is a desirable candidate for frequency-tunable, high-power, and low phase noise microwave or THz-wave generation [9

9. J. Liu, J. P. Yao, J. Yao, and T. H. Yeap, “Single-longitudinal-mode multiwavelength fiber ring laser,” IEEE Photon. Technol. Lett. 16(4), 1020–1022 (2004). [CrossRef]

14

14. X. Chen, Z. Deng, and J. Yao, “Photonic Generation of Microwave Signal using a Dual wavelength Single-Longitudinal Mode fiber Ring laser,” IEEE Trans. Micro. Theory Tech. 54(2), 804–809 (2006). [CrossRef]

] as wavelengths generation using photoconductive mixing technology does not require a high-quality microwave source, which can be very complex and expensive.

Several gain media approaches have been implemented either using erbium doped fiber amplifier (EDFA) [15

15. H. Okamura and K. Iwatsuki, “Simultaneous oscillation of wavelength tunable, singlemode lasers using an Er doped fiber amplifier,” Electron. Lett. 28(5), 461–463 (1992). [CrossRef]

], semiconductor optical amplifiers (SOA) [16

16. Y. W. Lee, J. Jung, and B. Lee, “Multiwavelength-switchable SOA-fiber ring laser based on polarization-maintaining fiber loop mirror and polarization beam splitter,” IEEE Photon. Technol. Lett. 16(1), 54–56 (2004). [CrossRef]

], stimulated Raman scattering [17

17. C.-S. Kim, R. M. Sova, and J. U. Kang, “Tunable multi-wavelength all fiber Raman source using fiber Sagnac loop filter,” Opt. Commun. 218(4-6), 291–295 (2003). [CrossRef]

19

19. Y. W. Lee, J. Jung, and B. Lee, “Multiwavelength-switchable SOA-fiber ring laser based on polarization-maintaining fiber loop mirror and polarization beam splitter,” IEEE Photon. Technol. Lett. 16(1), 54–56 (2004). [CrossRef]

], stimulated Brillouin scattering (SBS) [20

20. S. P. Smith, F. Zarinetchi, and S. Ezekiel, “Narrow-linewidth stimulated Brillouin fiber laser and applications,” Opt. Lett. 16(6), 393–395 (1991). [CrossRef] [PubMed]

,21

21. M. R. Shirazi, S. W. Harun, M. Biglary, and H. Ahmad, “Linear cavity Brillouin fiber laser with improved characteristics,” Opt. Lett. 33(8), 770–772 (2008). [CrossRef] [PubMed]

], or combination of the above techniques [22

22. Y.-G. Han, G. Kim, J. H. Lee, S. H. Kim, and S. B. Lee, “Lasing wavelength and spacing switchable multiwavelength fiber laser from 1510 to 1620 nm,” IEEE Photon. Technol. Lett. 17(5), 989–991 (2005). [CrossRef]

,23

23. M. H. Al-Mansoori, M. K. Abdullah, and S. J. Iqbal, “Threshold features of L-band linear cavity multiwavelength Brillouin-erbium fiber laser,” in Proceedings of IEEE TENCON Region 10 Annual International Conference (Institute of Electrical and Electronics Engineers, 2005), pp.1–4.

]. However, EDFA has limitations due to the strong homogenous line broadening and cross-gain saturation in the EDF that leads to an unstable oscillation. Different techniques such as hybrid gain medium [24

24. S. L. Pan, X. F. Zhao, and C. Y. Lou, “Switchable single-longitudinal-mode dual-wavelength erbium-doped fiber ring laser incorporating a semiconductor optical amplifier,” Opt. Lett. 33(8), 764–766 (2008). [CrossRef] [PubMed]

], an external light injection [25

25. M. Matsuura and N. Kishi, “Frequency Control Characteristics of a Single-Frequency Fiber Laser with an External Light Injection” IEEE J. Sel. Top. Quantum Electron. 7(1), 55–58 (2001).

], and an unpumped EDF as a saturable absorber (SA) based narrow bandwidth filter [26

26. Y. Cheng, J. T. Kringlebotn, W. H. Loh, R. I. Laming, and D. N. Payne, “Stable single-frequency traveling-wave fiber loop laser with integral saturable-absorber-based tracking narrow-band filter,” Opt. Lett. 20(8), 875–877 (1995). [CrossRef] [PubMed]

] are implemented to overcome this difficulty. In addition, the use of SOA in an EDFA based ring laser has been shown to suppress noise in the fiber laser [27

27. L. Xu, I. Glesk, V. Baby, and P. R. Prucnal, “Noise reduction in fiber ring lasers by use of a semiconductor optical amplifier,” in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper CWR1.

]. Hence, SOA approaches are of interest.

Wavelength selection in the cavity can be accomplished with different techniques. The most common ones are Fabry-Perot Etalon [28

28. X. P. Cheng, P. Shum, C. H. Tse, J. L. Zhou, M. Tang, W. C. Tan, R. F. Wu, J. Zhang, R. F. Wu, and J. Zhang, “Single-longitudinal-mode erbium-doped fiber ring laser based on high finesse fiber Bragg grating Fabry- Perot Etalon,” IEEE Photon. Technol. Lett. 20(12), 976–978 (2008).

,29

29. J. Sun, X. Yuan, X. Zhang, and D. Huang, “Single-longitudinal-mode fiber ring laser using fiber grating based Fabry-Perot filters and variable saturable absorbers,” Opt. Commun. 267(1), 177–181 (2006). [CrossRef]

], fiber comb filters [30

30. I. Yoon, Y. W. Lee, J. Jung, and B. Lee, “Tunable Multiwavelength Fiber Laser Employing a Comb Filter Based on a Polarization-Diversity Loop Configuration,” J. Lightwave Technol. 24(4), 1805–1811 (2006). [CrossRef]

] and interferometer filter [31

31. S. Calvez, X. Rejeaunier, P. Mollier, J.-P. Goedgebuer, and W. T. Rhodes, “Erbium-doped fiber laser tuning using two cascaded unbalanced Mach–Zehnder interferometers as intracavity filter: numerical analysis and experimental confirmation,” J. Lightwave Technol. 19(6), 893–898 (2001). [CrossRef]

]. Other alternatives are based on the use of phase shifted fiber Bragg gratings (FBGs) [10

10. Y. Yao, X. Chen, and S. Xie, “Dual-wavelength erbium-doped fiber laser with a simple linear cavity and its application in microwave generation,” IEEE Photon. Technol. Lett. 18(1), 187–189 (2006). [CrossRef]

], saturable absorber based Sagnac loop [29

29. J. Sun, X. Yuan, X. Zhang, and D. Huang, “Single-longitudinal-mode fiber ring laser using fiber grating based Fabry-Perot filters and variable saturable absorbers,” Opt. Commun. 267(1), 177–181 (2006). [CrossRef]

] and birefringent fibers within single or multiple fiber ring laser configurations [32

32. V. Baby, L. R. Chen, S. Doucet, and S. LaRochelle, “Continuous-wave operation of semiconductor optical amplifier-based multiwavelength tunable fiber lasers with 25-GHz spacing,” IEEE J. Sel. Top. Quantum Electron. 13(3), 764–769 (2007). [CrossRef]

] or in linear cavity [33

33. S. Feng, O. Xu, S. Lu, X. Mao, T. Ning, and S. Jian, “Single-polarization, switchable dual-wavelength erbium-doped fiber laser with two polarization-maintaining fiber Bragg gratings,” Opt. Express 16(16), 11830–11835 (2008). [CrossRef] [PubMed]

]. However, limitation of such approaches is the use of different type of fibers (e.g., single mode, high birefringent, polarization maintaining etc) that can jeopardize the robustness of the fiber laser, as well as, the necessary use of isolators and circulators in the fiber ring configuration. Furthermore, most of these FBG based approaches are limited to a few (e.g., 2-4) wavelengths and the wavelength tunability is limited, due to the limited tunability of FBGs.

In this paper, we demonstrate a simple compact, inexpensive, SOA-based, dual-wavelength tunable fiber laser, that can potentially be used for photoconductive mixing and generation of waves in the microwave or THz regions. A C-band commercially available SOA is used as the gain medium. Sagnac loop mirrors form the reflector and output ports in the cavity. Finally the wavelength selection is achieved through the use of a FBG and a tunable thin film-based filter. The proposed design does not require any expensive isolator, circulator, high birefringent fiber or high power pumps, thus leading to a less expensive design. The paper is structured as follows. In Section 2, we describe the experimental set-up and highlight the advantages. In Section, 3 we present the measurements and discuss the results. Finally in Section 4, we conclude and summarize the advantages of the approach and the potential applications.

2. Experimental set-up

The experimental setup is presented in Fig. 1
Fig. 1 Experimental setup of the SOA based dual loop mirror fiber laser.
. The linear cavity (Lc~11.5 m) fiber laser consists of three main components: (a) two Sagnac interferometers, LM1 and LM2, used simultaneously as broadband reflection mirrors and output ports (b) a commercial SOA for the gain medium and (c) a FBG with a reflection peak at 1544.28 nm and a 3-dB bandwidth of 0.28 nm is placed in the midway of the LM1, whereas a thin film based tunable filter (TF) (SANTEC OTF-655-03D) with FWHM of 0.3 nm and an insertion loss (IL) of ~1.8 dB is also placed in the same loop. We have looked into SANTEC OTF-320, which is also a thin film tunable filter but has a sharper roll off with a 3-dB and 20 dB bandwidths of 0.25 nm and 1.2 nm respectively. The transmission spectrum of the FBG and the tunable filters with an un-polarized spontaneous amplified emission (ASE) are shown in Fig. 2(a)
Fig. 2 Transmission spectrum of (a) Bragg Grating and (b) thin film filters.
and Fig. 2(b) respectively. A polarization controller (PC) is used in each of the loops to control the state of polarization of the signal to adjust the amount of light directed to the output of each loop or back in the cavity. The SOA is placed between LM1 and LM2. The reflectivity of loop LM2 is kept at 99.9%. Note that there is no optical isolator in the cavity. Hence the signal can propagate in both directions. A 90:10 optical tap is connected to the output port (OUT1), where the 10% port is connected to an optical spectrum analyzer (OSA). The spectrum analyzer is set at a resolution of 0.01 nm to monitor both the peak power and linewidth (full width half maximum-FWHM) of the laser. The 90% port is connected to the power meter to measure the total power of the laser. An optical isolator is placed at the output of the fiber laser to minimize back-reflections from the instrumentation. All fiber connections are performed using FC/APC connectors.

3. Characterization of the dual-wavelength fiber laser

3.1 Switchable operation: single and dual mode operation

When the SOA is driven by a bias current (IB) it emits amplified spontaneous emission (ASE) that propagates in both directions. The loop LM2 reflects almost 99.9% of the ASE back to the LM1. The two wavelengths that are selected to propagate and lase in the cavity are selected by the two filters in the cavity. In particular, one is selected by the FBG and the other by the thin film tunable filter. The two wavelength generations occur as follows: the ASE at the 3-dB coupler of the Sagnac loop, LM1, splits into two equal counter-propagating beams as shown in Fig. 1. In the middle of loop LM1, the counterclockwise (ccw) propagating beam encounters the FBG, which reflects the wavelength that falls within the FBG resonance bandwidth, λBG (1544.32 nm), back towards the 3-dB coupler. The rest of the wavelengths after passing through the FBG, pass through the tunable filter, which allows only the passband wavelength, λTF, to circulate fully in the loop, and all other wavelengths are rejected. Similarly, the clockwise (cw) propagating ASE encounters first the TF, which once again allows only the λTF to propagate towards the FBG. Since this selected wavelength (e.g., λTF) does not fall within the FBG resonance bandwidth, it is transmitted through the FBG. The cw λTF is then recombined with the ccw λTF at the 3-dB coupler. Hence, only the selected wavelength λTF from the TF and the λBG reflected by the FBG survive in the cavity. Hence, the fiber laser starts to lase at these two wavelengths. Note that the wavelength λBG, which is reflected from FBG and the incoming incident λBG (reflected by LM2) combine at the 3 dB coupler (at LM1) to produce Michelson-like interference at the output (OUT1). Simultaneously, the cw and ccw wavelengths selected by the tunable filter, λTF will propagate through the loop and interfere according to their phase difference, which is proportional to the birefringence of the fiber of the Sagnac loop. The polarization controller in LM1 (PC1) is used to control the fiber birefringence and hence a continuous control of the Sagnac loop reflectivity can be achieved. This fine adjustment of the reflectivity is used to balance the gain and loss of the cavity. Because of the polarization dependent loss in the cavity, the laser can be designed to operate in stable dual-wavelength or single-wavelength modes, at room temperature, by simply adjusting the PC1. In order to operate as a dual laser source, the PC1 is adjusted so that the cavity loss equals the overall gain of the SOA for both wavelengths. Figure 3
Fig. 3 Dual wavelength operation of the laser when the SOA is driven by a bias current of 100 mA.
shows the dual-wavelength operation of the laser with the lasing wavelengths at 1544.32 nm and 1549.5 nm corresponding to the reflection peak of the FBG and the passband wavelength of the tunable filter, respectively. The SOA is driven by a bias current of 100 mA.

The Optical Signal-to-Noise Ratio (OSNR) is measured to be about 39 dB for the dual wavelength operation. Note that the resolution of the OSA is set at 0.01nm for the measurement of OSNR for both the single and dual operation and we treat the suppressed second wavelength as the noise at the wavelength of interest in the single-wavelength operation (see Fig. 4
Fig. 4 Single-wavelength operation of the fiber laser (a) wavelength selected by the FBG (b) wavelength selected by the thin film based tunable filter.
). The 3-dB bandwidth at each lasing wavelengths, 1544.32 nm and 1549.5 nm are ~0.11 nm and ~0.08 nm, respectively (Fig. 3). We also investigate the characteristics of the dual-wavelength laser at three different SOA gain settings obtained by bias currents of IB = 150 mA, 200 mA and 300 mA. The 3-dB bandwidth, OSNR and output power for each of the wavelengths are shown in Table 1

Table 1. 3-dB bandwidth, OSNR and output power at different bias current for dual-wavelength operation selected by the Bragging grating (λBG) and the tunable filter (λTF).

table-icon
View This Table
. The 3-dB bandwidth is found to be the narrowest at the low gain setting (0.127 nm for 1544.32 nm and 0.104 nm for 1549.5nm) and the bandwidth increases as the SOA bias current increases to 300 mA as we expected. The maximum power of 3.9 dBm is measured for each wavelength at IB = 300 mA. The total cavity passive loss is found to be ~10 dB. However, this loss can be further reduced by replacing eight FC/APC connectors (not shown in Fig. 1) with splices.

The laser system can be easily switched to single wavelength operation from dual-wavelength operation by just adjusting the setting of PC1. For a particular setting of PC1 the cavity loss for one of the wavelengths becomes much higher than the loss of the other one. Hence, only one wavelength survives, whereas the other one, which exhibits the higher loss, is suppressed. The single-wavelength operation of the laser when the SOA is driven with IB = 100 mA is shown in Fig. 4. We adjust PC1 such that the wavelength selected by the tunable filter undergoes destructive interference, therefore, the cavity loss for λTF is increased and allows only wavelength λBG to resonate within the cavity. We are able to suppress the wavelength λTF significantly and achieve OSNR of 41 dB, as shown in Fig. 4(a). Similarly, for a different PC1 setting, the cavity loss for the λBG can be increased (Michelson-like interference) and hence, the wavelength selected by the tunable filter survives in the cavity. An OSNR of 43 dB is achieved as shown in Fig. 4(b).

3.2 Wavelength tunability

Another unique feature of the laser system is its capability of tuning the wavelength separation, Δλ, between the two operating wavelengths. The wavelength selected by the FBG, 1544.32 nm, is kept constant, whereas the wavelength selected by the tunable filter is tuned over the entire C-band as shown in Fig. 5
Fig. 5 Variable wavelength difference Δλ obtained by tuning the tunable thin film filter. (a) 5.3 nm, (b) 10.28 nm, (c) 15.28 nm. .
. The minimum separation of 0.87 nm is achieved with the present setup, however, if narrower bandwidth filters are used the minimum separation can be further reduced. This capability of tuning the wavelength separation can be exploited to generate wavelengths in THz and microwave region [14

14. X. Chen, Z. Deng, and J. Yao, “Photonic Generation of Microwave Signal using a Dual wavelength Single-Longitudinal Mode fiber Ring laser,” IEEE Trans. Micro. Theory Tech. 54(2), 804–809 (2006). [CrossRef]

].

3.3 Optical power and wavelength stability

The stability of the laser was measured by taking optical spectrum analyzer (OSA) measurements for one hour, at time intervals of two minutes. The OSA was set at a resolution of 0.01 nm and no averaging was used. Figure 6(a)
Fig. 6 Power and wavelength fluctuations of the laser at dual mode operation.
shows power fluctuations of <0.32 dB. The power fluctuations can be caused by the presence of multiple longitudinal modes in the laser source. In this work, no effort was made to curtail the laser cavity length, all the components were connected using relatively long pigtails for a total cavity length of about 11.5 m. This corresponds to a mode spacing of about 8.8 MHz. In order to experimentally determine the mode spacing the output of the laser was sent to a u2t photodetector and the beating signal analyzed with a spectrum analyzer. The observed mode spacing was about 8.5 MHz, in reasonable agreement with the cavity length measurement. Note that several methods have been recently proposed to achieve single-longitudinal-mode oscillation such as by using Sagnac filters and/or a saturable absorber [34

34. J. Sun, X. Yuan, X. Zhang, and D. Huang, “Single-longitudinal-mode dual-wavelength fiber ring laser by incorporating variable saturable absorbers and feedback fiber loops,” Opt. Commun. 273(1), 231–237 (2007). [CrossRef]

]. Another limitation in our experiment is the temperature fluctuation in the laboratory and the polarization drift due to the long fiber lengths of the fiber pigtailed components in our set-up. However, the power can be stabilized by proper packaging of the system. Similarly, the wavelength fluctuations were also measured for 60 minutes at time interval of one. We operated the laser in dual mode and recorded the fluctuation of both wavelengths. We noticed a wavelength variation of <0.024 nm as shown in Fig. 6(b).

4. Conclusions

References and links

1.

Y. W. Lee, J. Jung, and B. Lee, “Multiwavelength-switchable SOA-fiber ring laser based on polarization-maintaining fiber loop mirror and polarization beam splitter,” IEEE Photon. Technol. Lett. 16(1), 54–56 (2004). [CrossRef]

2.

J. Chow, G. Town, B. Eggleton, M. Ibsen, K. Sugden, and I. Bennion, “Multiwavelength generation in an erbium-doped fiber laser using in-fiber comb filters,” IEEE Photon. Technol. Lett. 8(1), 60–62 (1996). [CrossRef]

3.

M. A. Ummy, N. Madamopoulos, A. Joyo, M. Kouar, and R. Dorsinville, “Tunable multi-wavelength SOA based linear cavity dual-output port fiber laser using Lyot-Sagnac loop mirror,” Opt. Express 19(4), 3202–3211 (2011). [CrossRef] [PubMed]

4.

D. S. Moon, U.-C. Paek, and Y. Chung, “Multi-wavelength lasing oscillations in an Erbium-doped fiber laser using few-mode fiber Bragg grating,” Opt. Express 12(25), 6147–6152 (2004). [CrossRef] [PubMed]

5.

M. A. Ummy, N. Madamopoulos, P. Lama, and R. Dorsinville, “Dual Sagnac loop mirror SOA-based widely tunable dual-output port fiber laser,” Opt. Express 17(17), 14495–145001 (2009). [CrossRef] [PubMed]

6.

N. J. C. Libatique and R. K. Jain, “Precisely and rapidly wavelength-switchable narrow-linewidth 1.5μm laser source for wavelength division multiplexing applications,” IEEE Photon. Technol. Lett. 11(12), 1584–1586 (1999). [CrossRef]

7.

P. C. Peng, H.-Y. Tseng, and S. Chi, “A tunable dual-wavelength erbium-doped fiber ring laser using a self-seeded fabrycprot laser diode,” IEEE Photon. Technol. Lett. 15(5), 661–663 (2003). [CrossRef]

8.

Z. Chen, S. Ma, and N. K. Dutta, “Stable dual wavelength mode-locked Erbium-doped fiber ring laser,” in Frontiers in Optics, OSA Technical Digest, paper FTuG6.

9.

J. Liu, J. P. Yao, J. Yao, and T. H. Yeap, “Single-longitudinal-mode multiwavelength fiber ring laser,” IEEE Photon. Technol. Lett. 16(4), 1020–1022 (2004). [CrossRef]

10.

Y. Yao, X. Chen, and S. Xie, “Dual-wavelength erbium-doped fiber laser with a simple linear cavity and its application in microwave generation,” IEEE Photon. Technol. Lett. 18(1), 187–189 (2006). [CrossRef]

11.

G. Chen, D. Huang, X. Zhang, and H. Cao, “Photonic generation of a microwave signal by incorporating a delay interferometer and a saturable absorber,” Opt. Lett. 33(6), 554–556 (2008). [CrossRef] [PubMed]

12.

S. Pan and J. P. Yao, “A wavelength-switchable single-longitudinal-mode dual-wavelength erbium-doped fiber laser for switchable microwave generation,” Opt. Express 17(7), 5414–5419 (2009). [CrossRef] [PubMed]

13.

X. Chen, J. Yao, and Z. Deng, “Ultranarrow dual-transmission-band fiber Bragg grating filter and its application in a dual-wavelength single-longitudinal-mode fiber ring laser,” Opt. Lett. 30(16), 2068–2070 (2005). [CrossRef] [PubMed]

14.

X. Chen, Z. Deng, and J. Yao, “Photonic Generation of Microwave Signal using a Dual wavelength Single-Longitudinal Mode fiber Ring laser,” IEEE Trans. Micro. Theory Tech. 54(2), 804–809 (2006). [CrossRef]

15.

H. Okamura and K. Iwatsuki, “Simultaneous oscillation of wavelength tunable, singlemode lasers using an Er doped fiber amplifier,” Electron. Lett. 28(5), 461–463 (1992). [CrossRef]

16.

Y. W. Lee, J. Jung, and B. Lee, “Multiwavelength-switchable SOA-fiber ring laser based on polarization-maintaining fiber loop mirror and polarization beam splitter,” IEEE Photon. Technol. Lett. 16(1), 54–56 (2004). [CrossRef]

17.

C.-S. Kim, R. M. Sova, and J. U. Kang, “Tunable multi-wavelength all fiber Raman source using fiber Sagnac loop filter,” Opt. Commun. 218(4-6), 291–295 (2003). [CrossRef]

18.

C. Zhao, X. Yang, J. H. Ng, X. Dong, X. Guo, X. Wang, X. Zhou, and C. Lu, “Switchable dual-wavelength erbium-doped fiber-ring lasers using a fiber Bragg grating in high-birefringence fiber,” Microw. Opt. Technol. Lett. 41(1), 73–75 (2004). [CrossRef]

19.

Y. W. Lee, J. Jung, and B. Lee, “Multiwavelength-switchable SOA-fiber ring laser based on polarization-maintaining fiber loop mirror and polarization beam splitter,” IEEE Photon. Technol. Lett. 16(1), 54–56 (2004). [CrossRef]

20.

S. P. Smith, F. Zarinetchi, and S. Ezekiel, “Narrow-linewidth stimulated Brillouin fiber laser and applications,” Opt. Lett. 16(6), 393–395 (1991). [CrossRef] [PubMed]

21.

M. R. Shirazi, S. W. Harun, M. Biglary, and H. Ahmad, “Linear cavity Brillouin fiber laser with improved characteristics,” Opt. Lett. 33(8), 770–772 (2008). [CrossRef] [PubMed]

22.

Y.-G. Han, G. Kim, J. H. Lee, S. H. Kim, and S. B. Lee, “Lasing wavelength and spacing switchable multiwavelength fiber laser from 1510 to 1620 nm,” IEEE Photon. Technol. Lett. 17(5), 989–991 (2005). [CrossRef]

23.

M. H. Al-Mansoori, M. K. Abdullah, and S. J. Iqbal, “Threshold features of L-band linear cavity multiwavelength Brillouin-erbium fiber laser,” in Proceedings of IEEE TENCON Region 10 Annual International Conference (Institute of Electrical and Electronics Engineers, 2005), pp.1–4.

24.

S. L. Pan, X. F. Zhao, and C. Y. Lou, “Switchable single-longitudinal-mode dual-wavelength erbium-doped fiber ring laser incorporating a semiconductor optical amplifier,” Opt. Lett. 33(8), 764–766 (2008). [CrossRef] [PubMed]

25.

M. Matsuura and N. Kishi, “Frequency Control Characteristics of a Single-Frequency Fiber Laser with an External Light Injection” IEEE J. Sel. Top. Quantum Electron. 7(1), 55–58 (2001).

26.

Y. Cheng, J. T. Kringlebotn, W. H. Loh, R. I. Laming, and D. N. Payne, “Stable single-frequency traveling-wave fiber loop laser with integral saturable-absorber-based tracking narrow-band filter,” Opt. Lett. 20(8), 875–877 (1995). [CrossRef] [PubMed]

27.

L. Xu, I. Glesk, V. Baby, and P. R. Prucnal, “Noise reduction in fiber ring lasers by use of a semiconductor optical amplifier,” in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2004), paper CWR1.

28.

X. P. Cheng, P. Shum, C. H. Tse, J. L. Zhou, M. Tang, W. C. Tan, R. F. Wu, J. Zhang, R. F. Wu, and J. Zhang, “Single-longitudinal-mode erbium-doped fiber ring laser based on high finesse fiber Bragg grating Fabry- Perot Etalon,” IEEE Photon. Technol. Lett. 20(12), 976–978 (2008).

29.

J. Sun, X. Yuan, X. Zhang, and D. Huang, “Single-longitudinal-mode fiber ring laser using fiber grating based Fabry-Perot filters and variable saturable absorbers,” Opt. Commun. 267(1), 177–181 (2006). [CrossRef]

30.

I. Yoon, Y. W. Lee, J. Jung, and B. Lee, “Tunable Multiwavelength Fiber Laser Employing a Comb Filter Based on a Polarization-Diversity Loop Configuration,” J. Lightwave Technol. 24(4), 1805–1811 (2006). [CrossRef]

31.

S. Calvez, X. Rejeaunier, P. Mollier, J.-P. Goedgebuer, and W. T. Rhodes, “Erbium-doped fiber laser tuning using two cascaded unbalanced Mach–Zehnder interferometers as intracavity filter: numerical analysis and experimental confirmation,” J. Lightwave Technol. 19(6), 893–898 (2001). [CrossRef]

32.

V. Baby, L. R. Chen, S. Doucet, and S. LaRochelle, “Continuous-wave operation of semiconductor optical amplifier-based multiwavelength tunable fiber lasers with 25-GHz spacing,” IEEE J. Sel. Top. Quantum Electron. 13(3), 764–769 (2007). [CrossRef]

33.

S. Feng, O. Xu, S. Lu, X. Mao, T. Ning, and S. Jian, “Single-polarization, switchable dual-wavelength erbium-doped fiber laser with two polarization-maintaining fiber Bragg gratings,” Opt. Express 16(16), 11830–11835 (2008). [CrossRef] [PubMed]

34.

J. Sun, X. Yuan, X. Zhang, and D. Huang, “Single-longitudinal-mode dual-wavelength fiber ring laser by incorporating variable saturable absorbers and feedback fiber loops,” Opt. Commun. 273(1), 231–237 (2007). [CrossRef]

OCIS Codes
(140.3600) Lasers and laser optics : Lasers, tunable
(250.5980) Optoelectronics : Semiconductor optical amplifiers
(230.2285) Optical devices : Fiber devices and optical amplifiers
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 10, 2012
Revised Manuscript: August 14, 2012
Manuscript Accepted: August 23, 2012
Published: September 26, 2012

Citation
M. A. Ummy, N. Madamopoulos, M. Razani, A. Hossain, and R. Dorsinville, "Switchable dual-wavelength SOA-based fiber laser with continuous tunability over the C-band at room-temperature," Opt. Express 20, 23367-23373 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-21-23367


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References

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