Linewidth rapid measurement of narrow fiber laser by spectrum analyzer

An Panlong; Zhao Ruijuan; Zheng Yongqiu; Xue Chenyang; Zhang Chengfei; Li Xiaofeng; Yan Shubin; Liu Jun

For the linewidth measurement of the narrow linewidth laser, the resolution of the traditional spectrometer and the F-P interferometer is obviously insufficient to meet the requirement of linewidth measurement. In the experiment, a test platform was built using a spectrum analyzer based on the delay self-heterodyne method. Opportune parameters of the spectrum analyzer was set to distinguish noise suppression, using 20 km delay optical fiber based on the result of the calculation, 80 MHz acousto-optic frequency shifter(AOM)and 50:50 fiber coupler, achieve the photoelectric conversion by the photodetector.Optimally set the visual bandwidth(RBW), resolution bandwidth(VBW) and the scan range. Without reducing the testing sensitivity, the analyzer will distinguish overlapping signals and do not filter out too much high frequency to be distorted. Lorenz curve fitting was carried to the linewidth power spectrum peaks. Then it is achieved that the linewidth of the tunable wavelength fiber laser (1520-1570 nm) is about 161 kHz. It provides a reference to optimize the spectrumanalyzer parameter settings and calibrate the linewidth parameter of the narrow linewidth fiber laser.

1. Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education,North University of China,Taiyuan 030051,China;

2. School of Science,North University of China,Taiyuan 030051,China;

3. Science and Technology on Electronic Test & Measurement Laboratory,North University of China,Taiyuan 030051,China

Received Date: 2014-07-05

Rev Recd Date: 2014-08-18

Publish Date: 2015-03-25

Key words:

Abstract: For the linewidth measurement of the narrow linewidth laser, the resolution of the traditional spectrometer and the F-P interferometer is obviously insufficient to meet the requirement of linewidth measurement. In the experiment, a test platform was built using a spectrum analyzer based on the delay self-heterodyne method. Opportune parameters of the spectrum analyzer was set to distinguish noise suppression, using 20 km delay optical fiber based on the result of the calculation, 80 MHz acousto-optic frequency shifter(AOM)and 50:50 fiber coupler, achieve the photoelectric conversion by the photodetector.Optimally set the visual bandwidth(RBW), resolution bandwidth(VBW) and the scan range. Without reducing the testing sensitivity, the analyzer will distinguish overlapping signals and do not filter out too much high frequency to be distorted. Lorenz curve fitting was carried to the linewidth power spectrum peaks. Then it is achieved that the linewidth of the tunable wavelength fiber laser (1520-1570 nm) is about 161 kHz. It provides a reference to optimize the spectrumanalyzer parameter settings and calibrate the linewidth parameter of the narrow linewidth fiber laser.

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Reference (21)

[1]	Yang Xiufeng, Jia Guoqiang, Tong Zhengrong, et al. Narrow line width fiber laser measurement line width of the research [J]. Optical Communication Technology, 2012, 36(7): 4-6.(in Chinese)
[2]
[3]
[4]	He X, Fang X, Liao C, et al. A tunable and switchable single longitudinal mode dual wavelength fiber laser with a simple linear cavity [J]. Optics Express, 2009, 17(24): 21773-21781.
[5]	Tian Pengfei, Sun Xinxin. Single longitudinal mode and narrow linewidth fiber lasers [J]. Optical Fiber Electric Cable, 2010(5): 16-19. (in Chinese)
[6]
[7]
[8]	Takakura T, Iga K, Tako T. Linewidth measurement of a single longitudinal mode AlGaAs laser with a Fabry-Perot interferometer[J]. Japanese Journal of Applied Physics, 1980, 19(12): 725-727.
[9]	Okoshi T, Kikuchi K, Nakayama A. Novel method for high resolution measurement of laser output spectrum[J]. Electronics Letters, 1980, 16(16): 630-631.
[10]
[11]	Richter L E, Mandelberg H I, Kruger M S, et al. Linewidth determination from self-heterodyne measurements with subcoherence delay times[J]. IEEE Journal of Quantum Electronics, 1986, 22(11): 2070-2074.
[12]
[13]	Xie Donghong, Deng Dapeng, Guo Li, et al. Linewidth measurement method of narrow line width lasers[J]. Laser Optoelectronics Progress, 2013, 50(1): 010006. (in Chinese)
[14]
[15]	Gallion P B, Debarge G. Quantum phase noise and field correl-ation in single frequency semiconductor laser systems[J]. IEEE Journal of Quantum Electronics, 1984, 20(4): 343-349.
[16]
[17]
[18]	Shi Hanxing, Wu Tie. Basic requirements of the delayed self-heterodyne spectrum measurement system[J]. Journal of Beijing University of Posts and Telecommunications, 1997, 20(2): 55-60. (in Chinese)
[19]	Xiao Huaju, Wang Xiang, Ma Yun, et al. Linewidth measu-rement of narrow fiber laser based on the DSHI [J]. Optic-Electronic Engineering, 2010, 37(8): 57-61. (in Chinese)
[20]
[21]	Jia Yudong, Ou Pan, Yang Yuanhong, et al. Short fiber delayed self-heterodyne interferometer for ultra-narrow laser linewidth measurement[J]. Beijing University of Aeronautics and Astronautics, 2008, 34(5): 568-571. (in Chinese)

Linewidth rapid measurement of narrow fiber laser by spectrum analyzer

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