Query: fiber ring amplifier polarization

Candidate papers:

abstract: In this paper, a dual wavelength chaotic light source is proposed and demonstrated based on a fiber ring laser (FRL) with a semiconductor optical amplifier (SOA) as the intra cavity gain element. By properly adjusting the bias current and the polarization, the SOA FRL generates a high dimension chaotic optical output with 24 nm optical bandwidth. The temporal instability of the output originates from the optical feedback, as well as the nonlinear effects of both the SOA and the long fiber. With optical to electrical conversion, the output electrical signal presents a bandwidth of 13 GHz, which is only limited by the bandwidth of the detection system. By inserting a tunable bandpass filter (TBPF) into the cavity, the chaotic emission bandwidth is limited to 3.2 nm. The output is then divided into two parallel channels using a wavelength division multiplexer (WDM) Autocorrelation of the two outputs confirms fair randomness, while the cross correlation result verifies the independence of the two. With multi bit sampling and over sampling, dual channel true random number generation (TRNG) up to 960 Gbps per channel is achieved. Random sampling periods are adopted to reduce the influence of the time delay signature (TDS) which originates from the round trip delay of the laser cavity and affects the randomness of the output. At a significance level of 0.01 and a random sampling ratio of 10 4 the generated random bits can pass all the tests provided by the NITS SP800 22 test tool.
author_names: Yuhui Wan

Zhi'e Zhang

Zhengying Li

Honghai Wang

Xuelei Fu
title: A multi wavelength chaotic light source based on a semiconductor optical amplifier fiber ring laser
venue: Other Conferences
year: 2019

abstract: We report dual wavelength mode locked operation of a passively mode locked Er doped fiber laser (EDFL) including two sections of a fiber with equal length, one right hand twisted and another left hand twisted, and a double pass amplifier with Faraday Mirror (FM) The configuration allows cancellation of the influence of both linear and circular birefringence and strict control of the polarization of pulses in the cavity. Depending on the polarization azimuth we observed synchronous dual wavelength, 1532 nm and 1560 nm, noise like pulses (NLP) and desynchronized soliton emission.
author_names: L A Rodriguez-Morales

Ivan Armas-Rivera

H Santiago-Hernandez

Baldemar Ibarra-Escamilla

Manuel Duran-Sanchez

Marco V Hernandez-Arriaga

Eugene A Kuzin
title: Study of dual wavelength quasi mode locked regimes in a strict polarization controlled Er fiber ring laser
venue: LASE
year: 2019

abstract: Abstract Optical fiber amplifier is a vital device in optical communication system, which can directly amplify optical signal. We theoretically propose a type of few mode quantum dots doped fiber amplifier (FM QDFA) in this paper, capable of providing amplification for a number of linear polarization (LP) signal mode groups. The main part of the amplifier is a ring core fiber doped with PbS quantum dots. And refractive index difference between the annular area and cladding is set to 0.035, which weakens the modal coupling between different LP mode groups. The simulation results show that the ring core optical fiber not only supports transmission for LP(L=0~6,1) signal mode group, but also provides relatively uniform gain for LP(L=1~3,1) signal mode group across the wavelength band 1500 nm 1630 nm that covers the C L band. For these three signal modes, we explore the differential modal gain (DMG) under 11 pump mode groups (LP(L=0~10,1) Noticing that the highest gain for LP(1,1) signal mode is approximately 31 dB obtained at the wavelength of 1530 nm and the DMG is less than 0.5 dB with a LP (7,1) pumping mode.
author_names: Yana Shang

Yanan Kang

Lingmin Xu

Fufei Pang

Yanhua Dong

Na Chen

Jianxiang Wen

Zhenyi Chen

Tingyun Wang
title: Few mode ring core quantum dots doped optical fiber amplifier
venue: Optical Fiber Technology
year: 2019

abstract: Abstract All optical clock recovery (CR) from 20 Gbit/s nonreturn to zero differential phase shift keying (NRZ DPSK) signals are demonstrated experimentally by using a polarization maintaining fiber loop mirror filter (PMF LMF) and a semiconductor optical amplifier (SOA) fiber ring laser. Only by adjusting polarization controller (PC) NRZ DPSK signals were conveniently and fast converted to pseudo return to zero (PRZ) signal via PMF LMF. Then the PRZ signals are injected into the SOA fiber laser for CR. The recovered clock signals is with the extinction ratio (ER) of 10 dB and the root mean square (RMS) timing jitter of 750 fs in 2 31 1 long pseudorandom binary sequence (PRBS) NRZ DPSK signals measurement. Moreover, the broad wavelength tunability of recovered clock stemmed from the use of SOAs as modulator and the gain medium are shown too.
author_names: Fei Wang

Yu Yu

Xi Huang

Xinliang Zhang
title: All optical clock recovery of 20 Gbit/s NRZ DPSK signals using polarization maintaining fiber loop mirror filter and semiconductor optical amplifier fiber ring laser
year: 2009

abstract: We present a single frequency thulium doped fiber laser (TDFL) with a narrow linewidth of 20 kHz. Stable single longitudinal mode (SLM) lasing operation at 1957 nm is achieved using a segment of un pumped polarization maintaining thulium doped fiber (PM TDF) as an ultra narrow bandwidth filter. A high optical signal to noise ratio (OSNR) of over 60 dB is obtained and a high power of over 400 mW is achieved with a high slope efficiency ~45.8% thulium doped fiber amplifier (TDFA)
author_names: Taoce Yin

Yufu Song

Xiaogang Jiang

Feihong Chen

Sailing He
title: 400 mW narrow linewidth single frequency fiber ring cavity laser in 2 um waveband.
venue: Optics express
year: 2019

abstract: A reconfigurable and tunable multi tap bandpass microwave photonic filter based on a hybrid gain assisted multi wavelength fiber ring laser (HMFRL) is proposed and experimentally demonstrated. The HMFRL containing a hybrid gain medium and a high birefringence fiber loop mirror serves as the multiple taps generator for the microwave photonic filter. In order to realize a bandpass filter, the multiple taps are phase modulated, then the modulated signal is launched into a coil of dispersion compensating fiber to introduce different time delays for each tap. As a result, a bandpass response is obtained at the output of a high speeding photodetector. By adjusting the bias of the semiconductor optical amplifier from 344 to 450 mA, the number of multiple taps can be increased without optical signal to noise ratio degradation. Thus, a multi tap bandpass microwave photonic filter with bandwidth reconfiguring from 449 to 274 MHz is achieved. In addition, by changing the length of polarization maintaining fiber in the high birefringence fiber loop mirror, the wavelength spacing of the multiple taps can be adjusted, making the bandpass microwave photonic filter's free spectral range tunable.
author_names: Mengmeng Peng

Feng-Xia Wang

Lun Shi

Jingxin Huang

Wen Kang
title: Reconfigurable and tunable multi tap bandpass microwave photonic filter based on a hybrid gain assisted multi wavelength fiber ring laser
year: 2019

abstract: We experimentally characterize a fiber based ring resonator constructed from two commercially available 2x2 polarization maintaining directional couplers. This ring resonator has a maximum noise suppression of 25 dB and resonant transmission of 80% at 1550 nm. Its high transmission means this ring resonator is ideally suited for the spectral filtering of master oscillator power amplifier light sources in a robust, compact, and all fiber package. The limits of such a ring resonator for use in gravitational wave detectors are discussed, and we show how it could be used to filter the low power amplifier section and reduce the noise suppression requirements for the final free space mode cleaner.
author_names: J L H Mik

B M Sparkes

Christopher Perrella

Philip S Light

Sebastian W S Ng

Andre Nicholas Luiten

D J Ottaway
title: High transmission fiber ring resonator for spectral filtering of master oscillator power amplifiers
venue: OSA Continuum
year: 2019

abstract: We demonstrate the dual wavelength quasi mode locked operation of a passively mode locked Er doped fiber ring laser with twisted fiber in the cavity and a double pass amplifier with a Faraday mirror. The configuration allows very strict control of the polarization. We observed synchronous dual wavelength generation of noise like pulses (NLP) with spectra centered at 1534 nm and 1562 nm. Rotation of the azimuth of the radiation propagating in the cavity caused a switching between the generation of NLPs and packets of pulses with typical solitons spectrum. In the latter regime, we observed partially synchronous sub pulses at two different wavelengths.
author_names: L A Rodriguez-Morales

H Santiago-Hernandez

Olivier Pottiez

Y E Bracamontes-Rodriguez

Baldemar Ibarra-Escamilla

Manuel Duran-Sanchez

Marco V Hernandez-Arriaga

M Avazpour

Georgina Beltran-Perez

Evgeny A Kuzin
title: Dual wavelength quasi mode locked regimes of an Er doped fiber ring laser
year: 2018

abstract: An all fiber S band mode locked Er doped fiber ring laser operated at 1503 nm is experimentally demonstrated by utilizing the polarization additive pulse mode locking (P APM) mechanism. To the best of our knowledge, it is the first P APM mode locked fiber laser operating in the S band. The gain medium is an S band Er doped fiber amplifier (EDFA) composed of two Er doped fiber stages with the technique of depressed cladding to cut off the fundamental mode. Stable single pulse operation is achieved within the available pump power range. Besides, characterization of the S band EDFA module, such as the wavelength dependences of the gain and noise figure, the slope efficiency, as well as the dependence of the pump power on the gain for different input powers is performed. In addition, analysis of the proposed S band mode locked fiber laser, such as the pump power dependence of the pulse width and optical bandwidth, and pulse width compression is also provided.
author_names: Ling-Gang Yang

Siao-Shan Jyu

Chi Wai Chow

Chien-Hung Yeh

Yinchieh Lai
title: S band pulse generation by polarization additive pulse mode locking in an erbium doped all fiber ring laser
year: 2014

abstract: We describe a simple, narrow linewidth, tunable fiber based laser with a high degree of tuning accuracy. A polarization independent semiconductor optical amplifier (SOA) is used as the gain medium in a unidirectional fiber ring cavity with a circulator connected to a 6 meter long chirped fiber Bragg grating (CFBG) The laser wavelength is chosen by setting the modulation frequency of the SOA the same as the harmonics of the fundamental repetition rate of the light reflected at a specific point on the CFBG. Careful management of the drive current and pulse width helps to generate laser light of narrow linewidth (less than 0.03 nm) with low power variation (1.46 dB) over a tuning range of 40 nm.
author_names: Xiong Yang

Robert Lindberg

Walter Margulis

Krister Frojdh

F Laurell
title: Continuously tunable, narrow linewidth laser based on a semiconductor optical amplifier and a linearly chirped fiber Bragg grating.
venue: Optics express
year: 2019