Erbium-doped fiber amplifier gain-flatness of a Sagnac loop with an erbium-doped fiber
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摘要: 在通信领域，特别是波分复用方面，为了同时调整多通道增益和实现多波长光纤激光器大范围稳定的光波输出，本文提出了一种未泵浦掺铒光纤Sagnac环透射端掺铒光纤放大器增益平坦特性研究方案，其由Sagnac环自身谐振模式、未泵浦掺铒光纤的吸收特性和由环中双折射拍长引起的谐振模式3者共同作用。通过调节Sagnac环中的偏振控制器，使得掺铒光纤放大器（EDFA）增益光谱在非泵浦掺铒光纤Sagnac环透射端可以被部分或者全部平坦化。实验结果表明：在透射端14 nm的波长范围内，部分增益光谱的平坦度为±0.145 dB；整个C波段光谱36.5 nm的波长范围内，增益光谱的完全平坦度为±1.225 dB。该增益谱平坦方案结构简单，输出光谱平坦度好，有望用于波分复用系统和多波长激光器中。
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关键词:
- 掺铒光纤放大器增益平坦 /
- 未泵浦掺铒光纤Sagnac环 /
- 放大自发辐射 /
- 增益谱平坦度 /
- 双折射拍长
Abstract: In order to achieve the simultaneous adjustment of multi-channel gain in the communications, especially in WDM, and to develop a wide range of stable light outputs in multi-wavelength fiber lasers, a research scheme of the erbium-doped fiber amplifier gain flattening characteristic at the transmission-port of a Sagnac loop with an unpumped erbium-doped fiber is proposed. The scheme is a combination of the self-resonance mode of the Sagnac loop, the absorption characteristics of unpumped erbium-doped fiber and the resonance mode caused by birefringence beat length in the loop. By adjusting the polarization controllers properly in the loop, the gain spectrum can be partially or completely flattened at the transmission port of the Sagnac loop. The results show that, on one hand, the part of the spectrum is flatted within ±0.145 dB in the wavelength range of 14 nm at the transmission port, but on the other hand, the total spectrum is flatted within ±1.225 dB over a bandwidth of 36.5 nm in the whole C-band at the transmission port. The gain spectrum flattening scheme has a simple structure and good flatness of the output spectrum. It is expected that this technology will be used in WDM systems and multi-wavelength lasers. -
图 1 EDFA增益平坦实验装置图及示意图
Figure 1. Experimental setup and schematic diagram of the gain-flattened EDFA
图 3 不同泵浦功率下的EDF吸收曲线
Figure 3. Absorption of the EDF at different pump powers and ASE gain spectra
图 4 不同泵浦功率下，透射端EDFA增益光谱部分平坦前后对比图
Figure 4. Comparison diagram of EDFA spectra before and after flattening partially at transmission port with different pump powers
图 5 透射端EDFA增益光谱全部平坦前后对比图
Figure 5. Comparison of EDFA spectra before and after complete flattening at transmission port
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[1] MEARS R J, REEKIE L, JAUNCEY I M, et al. Low-noise erbium-doped fibre amplifier operating at 1.54 μm[J]. Electronics Letters, 1987, 23(19): 1026-1028. doi: 10.1049/el:19870719 [2] SRIVASTAVA A K, SUN Y, ZYSKIND J L, et al. EDFA transient response to channel loss in WDM transmission system[J]. IEEE Photonics Technology Letters, 1997, 9(3): 386-388. doi: 10.1109/68.556082 [3] YANG A, WANG T, ZHENG J Q, et al. A single-longitudinal-mode narrow-linewidth dual-wavelength fiber laser using a microfiber knot resonator[J]. Laser Physics Letters, 2019, 16(9): 025104. [4] YANG Z Q, HUANG T J, CHANG Y J, et al. Switchable dual-wavelength single-longitudinal-mode erbium fiber laser utilizing a dual-ring scheme with a saturable absorber[J]. Laser Physics, 2018, 28(6): 065104. doi: 10.1088/1555-6611/aab655 [5] HUI X L, LIN R J. Gain efficient L-band EDFA with dynamic gain equalization[J]. Acta Optica Sinica, 2003, 23(S1): 355-356. [6] ZHANG L, ZHAN L, et al. Large-region tunable optical bistability in saturable absorber-based single-frequency Brillouin fiber lasers[J]. Journal of the Optical Society of America B, 2015, 32(6): 1113-1119. doi: 10.1364/JOSAB.32.001113 [7] 颜玢玢, 王葵如, 余重秀, 等. 增益平坦的多波长泵浦宽带拉曼光纤放大器[J]. 光学 精密工程,2006,14(2):155-158.YAN B B, WANG K R, YU CH X, et al. Broadband gain-flattened multiwavelength pumped Raman fiber amplifier[J]. Optics and Precision Engineering, 2006, 14(2): 155-158. (in Chinese) [8] 聂玲, 饶云江, 廖天奎. 掺铒光纤放大器自动增益控制的DSP实现方法[J]. 光学 精密工程,2004,12(3):108-110.NIE L, RAO Y J, LIAO T K. Automatic gain control of EDFAs using DSP[J]. Optics and Precision Engineering, 2004, 12(3): 108-110. (in Chinese) [9] 赵小丽, 张钰民, 庄炜, 等. 级联光栅结合Sagnac环的可调谐光纤激光器[J]. 发光学报,2019,40(3):357-365. doi: 10.3788/fgxb20194003.0357ZHAO X L, ZHANG Y M, ZHUANG W, et al. Tunable fiber laser based on cascaded grating combing with Sagnac loop[J]. Chinese Journal of Luminescence, 2019, 40(3): 357-365. (in Chinese) doi: 10.3788/fgxb20194003.0357 [10] WANG P H, WANG L, SHI G H, et al. Stable multi-wavelength fiber laser with single-mode fiber in a Sagnac loop[J]. Applied Optics, 2016, 55(12): 3339-3342. doi: 10.1364/AO.55.003339 [11] SONG Y J, ZHAN L, HU S, et al. Tunable multiwavelength Brillouin-erbium fiber laser with a polarization-maintaining fiber Sagnac loop filter[J]. IEEE Photonics Technology Letters, 2004, 16(9): 2015-2017. doi: 10.1109/LPT.2004.833097 [12] GUO CH Y, LUO R H, LIU W Q, et al. Comb multi-wavelength, rectangular pulse, passively mode-locked fiber laser enhanced by un-pumped Erbium-doped fiber[J]. Optics Communications, 2018, 406: 107-111. doi: 10.1016/j.optcom.2017.07.080 [13] HE W, ZHU L Q, MENG F Y, et al. Selectable and stable C-band multi-wavelength ring cavity erbium-doped fiber laser employing Sagnac loop and tunable filter[J]. Optik, 2019, 176: 528-534. doi: 10.1016/j.ijleo.2018.09.063 [14] ROTA-RODRIGO S, IBAÑEZ I, LÓPEZ-AMO M. Multi-wavelength fiber laser in single-longitudinal mode operation using a photonic crystal fiber Sagnac interferometer[J]. Applied Physics B, 2013, 110(3): 303-308. doi: 10.1007/s00340-012-5325-x [15] CHEN D. Stable multi-wavelength erbium-doped fiber laser based on a photonic crystal fiber Sagnac loop filter[J]. Laser Physics Letters, 2007, 4(6): 437-439. doi: 10.1002/lapl.200710003 [16] 车永康, 侯尚林, 雷景丽, 等. 高非线性光纤中受激布里渊散射快光提前及脉冲形变[J]. 发光学报,2017,38(8):1083-1089. doi: 10.3788/fgxb20173808.1083CHE Y K, HOU SH L, LEI J L, et al. Time advancement and pulse distort of stimulated Brillouin scattering fast light high nonlinear optical fibers[J]. Chinese Journal of Luminescence, 2017, 38(8): 1083-1089. (in Chinese) doi: 10.3788/fgxb20173808.1083 [17] HUANG F Q, CHEN T, SI J H, et al. Fiber laser based on a fiber Bragg grating and its application in high-temperature sensing[J]. Optics Communications, 2019, 452: 233-237. doi: 10.1016/j.optcom.2019.05.046 [18] ZHANG K, KANG J U. C-band wavelength-swept single-longitudinal-mode erbium-doped fiber ring laser[J]. Optics Express, 2008, 16(18): 14173-14179. doi: 10.1364/OE.16.014173 [19] LIU Y, ZHANG M J, WANG P, et al. Multiwavelength single-longitudinal-mode Brillouin- erbium fiber laser sensor for temperature measurements with ultrahigh resolution[J]. IEEE Photonics Journal, 2015, 7(5): 6802809. [20] 石俊凯, 王国名, 纪荣祎, 等. 结构紧凑的双波长连续波掺铒光纤激光器[J]. 中国光学,2019,12(4):810-819. doi: 10.3788/co.20191204.0810SHI J K, WANG G M, JI R Y, et al. Compact dual-wavelength continuous-wave Er-doped fiber laser[J]. Chinese Optics, 2019, 12(4): 810-819. (in Chinese) doi: 10.3788/co.20191204.0810 [21] 况庆强, 桑明煌, 梁培斯, 等. 光纤中超连续谱的产生及多波长输出[J]. 发光学报,2010,31(1):137-140.KUANG Q Q, SANG M H, LIANG P S, et al. Supercontinuum generation and multi-wavelength output in fiber[J]. Chinese Journal of Luminescence, 2010, 31(1): 137-140. (in Chinese) [22] KUMAR N, SHENOY M R, PAL B P. A standard fiber-based loop mirror as a gain-flattening filter for erbium-doped fiber amplifiers[J]. IEEE Photonics Technology Letters, 2005, 17(10): 2056-2058. doi: 10.1109/LPT.2005.856323 [23] YEH C H, YANG Z Q, HUANG T J, et al. Utilizing wheel-ring architecture for stable and selectable single-longitudinal-mode erbium fiber laser[J]. Optics Communications, 2018, 410: 923-925. doi: 10.1016/j.optcom.2017.11.074 [24] LI SH P, CHIANG K S, GAMBLING W A. Gain flattening of an erbium-doped fiber amplifier using a high-birefringence fiber loop mirror[J]. IEEE Photonics Technology Letters, 2001, 13(9): 942-944. doi: 10.1109/68.942654 [25] LIU Y, YU J L, WANG W R, et al. Single longitudinal mode brillouin fiber laser with cascaded ring Fabry–Pérot resonator[J]. IEEE Photonics Technology Letters, 2014, 26(2): 169-172. doi: 10.1109/LPT.2013.2290191 [26] LI L, ZHANG M J, LIU Y, et al. Stable single-longitudinal-mode erbium-doped fiber laser with narrow linewidth utilizing parallel fiber ring resonator incorporating saturable absorber and fiber Bragg grating[J]. Applied Optics, 2015, 54(13): 4001-4005. doi: 10.1364/AO.54.004001 [27] MORTIMOR D B. Fiber loop reflectors[J]. Lightwave Technology Journal, 1998, 6(7): 1217-1224. [28] 贾振安, 李丽, 乔学光, 等. 高平坦度的三级双泵浦结构C+L波段超荧光光源[J]. 光学 精密工程,2010,18(3):558-562.JIA ZH A, LI L, QIAO X G, et al. High flattening C+L-band erbium-doped superfluorescent light source with three-stage two-pumping structure[J]. Optics and Precision Engineering, 2010, 18(3): 558-562. (in Chinese) [29] ZOU H, LOU SH Q, YIN G L, et al. Switchable dual-wavelength PM-EDF ring laser based on a novel filter[J]. IEEE Photonics Technology Letters, 2013, 25(11): 1003-1006. doi: 10.1109/LPT.2013.2253453 -
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