Generation and coherent characteristics analysis of laser phase modulation spectrum by cascaded phase modulators

Abstract

Laser phase modulation spectrum with 25 frequency bands is generated by modulating a single frequency laser with two cascaded phase modulators (PMs) with driving voltage amplitudes at 3.2 V and 7.8 V, respectively. And the time delay self-heterodyne method is adopted to measure and analyze the coherent characteristics of the original single frequency laser light and the generated multi-frequency light from two phase modulation schemes. By comparison of laser linewidth, the experimental results show that the laser phase modulation does not change the coherent characteristics of each frequency band, and the laser phase modulation spectra benefit the performance optimization for the Rayleigh scattering based optical fiber sensing system.

References

[1] WangD, XiL, TangX, et al.. A simple photonic precoding-less scheme for vector millimeter-wave signal generation based on a single phase modulator[J]. Results in physics, 2020, 19(103412):1-5

[2] WeiX, MuH, LiM, et al.. Arbitrary free spectral range control of optical frequency combs based on an optical tapped delay line structure cascaded with a phase modulator[J]. Optoelectronics letters, 2021, 17(7):0390-0394

[3] CuiY, WangZ, XuY, et al.. Generation of flat optical frequency comb using cascaded PMs with combined harmonics[J]. IEEE photonics technology letters, 2022, 34(9):490-493

[4] GuoY, WangM, MuH, et al.. Simultaneous frequency and bandwidth doubling linearly chirped waveform generation based on cascaded phase modulator and dual-output dual-parallel Mach-Zehnder modulator[J]. Optik, 2021, 243(19):167384

[5] UllahS, UllahR, ZhangQ, et al.. Ultra-wide and flattened optical frequency comb generation based on cascaded phase modulator and LiNbO₃-MZM offering terahertz bandwidth[J]. IEEE access, 2020, 8: 76692-76698

[6] SumidaM. Optical time domain reflectometry using an M-ary FSK probe and coherent detection[J]. Journal of lightwave technology, 1996, 14(11):2483-2491

[7] IidaH, KoshikiyaY, ItoF, et al.. High-sensitivity coherent optical time domain reflectometry employing frequency-division multiplexing[J]. Journal of lightwave technology, 2012, 30(8):1121-1126

[8] LuL, SongY, FanZ, et al.. Dual frequency probe based coherent optical time domain reflectometry[J]. Optics communications, 2012, 285(10):2492-2495

[9] LuL, SongY, FanZ, et al.. Coherent optical time domain reflectometry using three frequency multiplexing probe[J]. Optics and lasers in engineering, 2012, 50(12):1735-1739

[10] LuL, SongY, ZhangX, et al.. Frequency division multiplexing OTDR with fast signal processing[J]. Optics & laser technology, 2012, 44(7):2206-2209

[11] ZhouJ, PanZ, YeQ, et al.. Characteristics and explanations of interference fading of a phi-OTDR with a multi-frequency source[J]. Journal of lightwave technology, 2013, 31(17):2947-2954

[12] QianH, LuoB, HeH, et al.. Fading-free φ-OTDR with multi-frequency decomposition[J]. IEEE sensors journal, 2022, 22(3):2160-2166

[13] XuN, WangP, WangY, et al.. Crosstalk noise suppressed for multi-frequency φ-OTDR using compressed sensing[J]. Journal of lightwave technology, 2021, 39(22):7343-7349

[14] LvL, SongY, ZhuF, et al.. Performance limit of a multi-frequency probe based coherent optical time domain reflectometry caused by nonlinear effects[J]. Chinese optics letters, 2012, 10(4):4

[15] LuL, SunX, BuX, et al.. Coherent optical time domain reflectometry by logarithmic detection and timed random frequency hopping[J]. Optical engineering, 2017, 56(2): 024106

[16] WangZ, WuY, XiongJ, et al.. Bipolar-coding φ-OTDR with interference fading elimination and frequency drift compensation[J]. Journal of lightwave technology, 2020, 38(21): 6121-6128

[17] HanM, WangA. Analysis of a loss-compensated recirculating delayed self-heterodyne interferometer for laser linewidth measurement[J]. Applied physics B, 2005, 81(1):53-58

[18] ChenM, ZhouM, WangJ, et al.. Ultra-narrow linewidth measurement based on Voigt profile fitting[J]. Optics express, 2015, 23(5):6803-6808