A dual-pass Mach–Zehnder interferometer filter using a TCF loop mirror for double-wavelength fiber lasers

Abstract

A dual-pass Mach-Zehnder interferometer filter using a section of twin-core fiber (TCF) loop mirror is proposed. The filter is theoretically and experimentally studied for various interferometer arm difference when TCF length is constant. Theoretical results are validated by the experimental demonstration and in good agreement with the experimental results. And then, by using the filter in a ring fiber laser, a stable and switchable dual-wavelength lasing is obtained experimentally. The 3-dB bandwidth and the SMSR of the output laser are 0.015 nm and higher than 62.4 dB, respectively. The peak power fluctuation and wavelength shift are also monitored to be less than 0.04 dB and 0.02 nm over an hour at room temperature. Furthermore, the output laser can be switched between single and dual wavelength by carefully adjusting the PCs. The experimental results show that the filter can suppress mode competition effectively, improve the SMSR availably, and enhance the stability of the output lasing.

Large dynamic range operation of ultra-higher number MWFLs affected by MZI-SI

“…effect have shown the potential of achieving a multiwavelength comb filter spectrum [6,14,[17][18][19]. The Sagnac loop filter is attractive due to its simple design with fewer passive optical components, low insertion loss, polarization independence and high performance for filter effects [20,21].…”

Stable and tunable narrow-linewidth erbium-doped fibre laser based on polarization-maintaining fibre ring filter and PM-FBG

“…Stable and tunable narrow-linewidth erbium-doped fibre laser based on polarization-maintaining fibre ring filter and PM-FBG Wei He 1,2 , Lianqing Zhu 1,2 , Mingli Dong 2 , Fei Luo 2 and Xiaohuai Chen 1 2013, Zou et al [7] reported a dual-wavelength erbiumdoped fibre laser (EDFL) based on a dual-pass MZI using a twin-core fibre; when a single line was emitted, the wavelength shift and power fluctuation were 0.02 nm and 0.06 dB respectively, while for dual-wavelength emission, a 0.35 dB peak power drift and a 0.16 nm wavelength interval were obtained. In 2013, Zhou and Luo [8] introduced a tunable EDFL based on an MZI incorporating thermally expanded core fibre; the tuning scope was larger than 40 nm, the wavelength interval was 2.3 nm, and the 3 dB linewidth was smaller than 0.1 nm.…”

Multiwavelength tunable erbium‐doped fiber laser based on Fabry–Perot filter and Mach–Zenhder interferometer

“…The tuning range for the proposed TDFL was from 1813.52–1858.70 nm. Zou et al reported a multiwavelength EDFL based on a dual‐pass Mach–Zehnder interferomet er (MZI) filter using a twin‐core fiber loop mirror. Using this EDFL, tunable single‐ and dual‐wavelength lines were realized.…”