Search query: Suppression of intensity noise of fiber laser

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abstract: A significant broad bandwidth near shot noise limited intensity noise suppression of a single frequency fiber laser is demonstrated based on a semiconductor optical amplifier (SOA) with optoelectronic feedback. By exploiting the gain saturation effect of the SOA and the intensity feedback loop, a maximum noise suppression of over 50 dB around the relaxation oscillation frequencies and a suppression bandwidth of up to 50 MHz are obtained. The relative intensity noise of 150 dB/Hz in the frequency range from 0.8 kHz to 50 MHz is achieved, which approaches the shot noise limit. The obtained optical signal to noise ratio is more than 70 dB. This near shot noise limited laser source shows important implications for the advanced fields of high precision frequency stabilization, quantum key distribution, and gravitational wave detection.
author_names: Qilai Zhao

Shanhui Xu

Kaijun Zhou

Changsheng Yang

Can Li

Zhouming Feng

Mingying Peng

Huaqiu Deng

Zhongmin Yang
title: Broad bandwidth near shot noise limited intensity noise suppression of a single frequency fiber laser.
venue: Optics letters
year: 2016

abstract: An all optical frequency and intensity noise suppression technique of a single frequency fiber laser is demonstrated. By exploiting the recursive noise reduction effect of a semiconductor optical amplifier (SOA) in a self injection locked fiber laser, the frequency and intensity noise of the laser are remarkably suppressed in a significantly wide frequency range. In addition to the linewidth suppression from 3.5 kHz to 700 Hz, the frequency noise has been reduced by ~25 dB. After suppression, the relative intensity noise (RIN) is within 5 dB of the shot noise limit at frequencies from 1.5 to 3 MHz, and the frequency range of the suppression reaches about 30 MHz. The relaxation oscillation peak is observed to shift to lower frequencies and is reduced by about 35 dB from 90 dB/Hz to 125 dB/Hz. It is believed that the achieved low noise makes the fiber laser a promising candidate in applications such as ultra long haul coherent optical communication and LIDAR.
author_names: Can Li

Shanhui Xu

Xiang Huang

Yu Xiao

Zhouming Feng

Changsheng Yang

Kaijun Zhou

Wei Lin

Jiulin Gan

Zhongmin Yang
title: All optical frequency and intensity noise suppression of single frequency fiber laser.
venue: Optics letters
year: 2015

abstract: The frequency and intensity noise of an Yb3+ doped single frequency distributed Bragg reflector (DBR) fiber laser are effectively reduced by a simple, passive optical feedback loop (POFL) which consists of only two optical couplers. The feedback loop, which has resonance with the high reflective grating of the DBR laser and relative long optical path compared to the DBR cavity, results in narrower linewidth and lower relative intensity noise (RIN) in the feedback signal. The RIN of relaxation oscillation is reduced by 20dB from 99.9dB/Hz 993 kHz to 119.4dB/Hz 192 kHz, and the frequency noise was suppressed at frequencies higher than 1 kHz, with a maximum reduction of about 30 dB from 10 kHz to 100 kHz, which results in a spectral linewidth compression from 3.96 kHz to 540 Hz. Even after one fiber amplification stage, the noise did not increase significantly, and a spectral linewidth well below 1 kHz were also achieved at output power of 10W.
author_names: Yubin Hou

Qian Zhang

Pu Wang
title: Frequency and intensity noise suppression in Yb3+ doped single frequency fiber laser by a passive optical feedback loop.
venue: Optics express
year: 2016

abstract: The suppression of the low frequency intensity noise of a 1083 nm single frequency Yb3+ doped phosphate fiber laser is reported. The noise suppression scheme is to use a liquid crystal device as a variable attenuator to modulate the laser power to close to the desired level. The achieved long term (12 h) laser instability is less than 0.2% while the relative intensity noise (RIN) has been decreased to lower than 140 dB Hz 1 at frequencies from 250 Hz to 1 kHz. Moreover, the laser linewidth value remains the same as before suppression, while the degree of polarization (DOP) declined slightly.
author_names: Zhouming Feng

Can Li

Shanhui Xu

Changsheng Yang

Shupei Mo

Dongdan Chen

Mingying Peng

Z M Yang
title: Suppression of the low frequency intensity noise of a single frequency Yb3+ doped phosphate fiber laser at 1083 nm
year: 2014

abstract: Significant suppression of the intensity noise of single frequency fiber laser is demonstrated with a cascading semiconductor optical amplifier (SOA) Based on the nonlinear amplification dynamics of the SOA, intensity noise reduction would take place in every transmission of the laser signal. By cascading two SOAs, a maximum noise suppression of 30 dB at around the resonant relaxation oscillation (RRO) frequency as well as a suppression bandwidth of up to 50 MHz is realized. Moreover, the RRO peak is restricted to a significant narrow frequency band, outside of which the laser noise approaches the noise floor of the measurement. The remarkable amplified spontaneous emission (ASE) introduced by the SOA is entirely filtered out with a fiber Bragg grating (FBG) Furthermore, no noticeable degradation of laser frequency noise has been observed.
author_names: Zhouming Feng

Can Li

Shanhui Xu

Xiang Huang

Changsheng Yang

Kaijun Zhou

Jiulin Gan

Huaqiu Deng

Zhongmin Yang
title: Significant intensity noise suppression of single frequency fiber laser via cascading semiconductor optical amplifier
year: 2015

abstract: Low intensity noise laser sources are a fundamental prerequisite for demanding fundamental research such as interferometric gravitational wave detection (GWD) [1] precision spectroscopy, LIDAR, and ultra cold atom/molecular optical lattices. Besides, high power lasers with low intensity noise also attract great interest in the industry applications. Direct pump current control is the simplest method to suppress the laser intensity noise. However, the modulation of high current multi mode pump diodes is not straightforward and achieving wide feedback control bandwidth beyond 200 kHz is challenging. For the laser sources used in GWD, the intensity noise could be suppressed down to 140 dBc/Hz (1 kHz 10 kHz) for an output power of 160 W. However, this approach requires a quite complex setup and the feedback bandwidth is limited to ~10 kHz [1]
author_names: Jian Zhao

Germain Guiraud

Florian Floissat

Benoit Gouhier

Sergio Rota-Rodrigo

Nicholas Traynor

Giorgio Santarelli
title: Gain dynamics and intensity noise suppression of a clad pumped Yb fiber amplifier
venue: 2017 Conference on Lasers and Electro Optics Europe European Quantum Electronics Conference (CLEO/Europe EQEC)
year: 2017

abstract: The supermode noise in an actively mode locked fiber laser is suppressed for the first time by a so called pulse intensity feed forward technique. In this novel scheme, the optical pulse is firstly converted into an electronic signal, and then fed forward to a dual drive Mach Zehnder modulator (MZM) where the optical pulse is modulated by the reversed intensity profile of itself. In a 12.5 m long actively mode locked fiber ring laser experiment, the resulting power limiting shows a stable 10 GHz optical pulse train with a supermode suppression ratio larger than 81 dB. The phase noise and pulse to pulse timing jitter are below 141 dBc Hz 1 at 10 MHz and 22.1 fs, respectively. Compared with the conventional fiber nonlinearity based power limiting schemes, our proposal is compact and stable.
author_names: Kun Xu

Ruixin Wang

Yitang Dai

Feifei Yin

Jianqiang Li

Yuefeng Ji

Jintong Lin
title: Supermode noise suppression in an actively mode locked fiber laser with pulse intensity feed forward and a dual drive MZM
year: 2013

abstract: Abstract A feasible approach is theoretically demonstrated that suppresses the relative intensity noise (RIN) transfer from pump sources to the proposed Raman fiber laser (RFL) output at the first order Stokes line. The technique is accomplished by injecting a modulated signal at second order Stokes shift from the pump wavelength according to the monitored RFL output, which indirectly consumes the pump power fluctuations and results in suppression of the RIN transfer to the RFL output. With the RFL used as a pump source for co pumped Raman fiber amplifiers, further calculation results show that the Q factor penalty due to RIN transfer can be dramatically reduced.
author_names: Ying Wu Zhou

Guoyong Sun
title: Suppression of pump to Stokes relative intensity noise transfer in Raman fiber laser by injection of modulated signal
year: 2011

abstract: We proposed an experimental investigation into the low frequency intensity noise characteristics of erbium doped distributed feedback fiber lasers (DFB FL) And the paper presented a simple self injection locking (SIL) configuration of DFB fiber laser to suppress the intensity noise. One of the reasons caused intensity noise is the existence of multimode in the DFB FL. SIL inhibits other modes while enhances dominant mode. Process of locking mode occurred in the DFB FL was measured in this paper. Comparison of the output powers with and without injection gives a sufficient proof, that it can realize the stable lasing by injecting the feedback laser into the cavity again. When the current of 980nm pump is about 175mA, the intensity noise is suppressed about 25 dB, and relaxation oscillation frequency decreased from 126.5 KHz to 60 KHz in this paper. The results have potential application in high sensitive fiber sensors and optical communication.
author_names: Yanjie Zhao

Chang Wang

Jiasheng Ni

Jun Chang

Pengpeng Wang

Gangding Peng

Tong-yu Liu

Qingpu Wang
title: Study of DFB fiber laser intensity noise and its suppression
venue: Asia Pacific Optical Sensors Conference
year: 2012

abstract: We demonstrate suppression of relative intensity noise by ;25 dB for the primary output of a stimulated Brillouin fiber laser by operating above the threshold for second order stimulated Brillouin scattering.
author_names: Michael L Dennis

Patrick T Callahan

Michael C Gross
title: Suppression of relative intensity noise in a Brillouin fiber laser by operation above second order threshold
venue: 2010 IEEE Photinic Society's 23rd Annual Meeting
year: 2010