Multi-wavelength switchable erbium-doped fiber laser based on a hybrid filter incorporating a bi-tapered Mach–Zehnder interferometer and Sagnac loop

Abstract

A multi-wavelength switchable C-band erbium-doped fiber laser based on a hybrid comb filter composed of a Sagnac loop and Mach–Zehnder interferometer (MZI) is designed and experimentally demonstrated. In the designed ring cavity fiber laser, the MZI is composed of bi-tapered single-mode fiber fabricated by etching with hydrofluoric acid. In the experiment, the wavelength intervals in the comb spectra of the Sagnac loop and MZI are 3.4 and 18.8 nm, respectively, and by combining the Sagnac loop and MZI, measurements of the hybrid comb spectrum are obtained. When the pump power is 91 mW, lasing occurs at 1529.2 nm. Adjustment of the variable attenuator (VA) can provide 1541.9 and 1558.6 nm single-wavelength switchable lasers, for which the maximum peak power difference is less than 3.59 dB, the signal-to-noise ratio (SNR) exceeds 19.25 dB, and the peak power fluctuation is less than 0.34 dB over a 30 min scan time at 26 °C. For dual-wavelength switchable laser emission, four different sets of wavelengths can be realized, and the SNR exceeds 15.57 dB with power fluctuations of less than 1.6 dB, under the same monitoring conditions. By further adjusting the VA, stable and tunable triple-wavelength lasing is also realizable; under these conditions, the SNR exceeds 15.02 dB and the power fluctuation is less than 0.91 dB. Furthermore, four- and five-wavelength lasing can also be achieved by adjusting the VA again, with SNRs exceeding 19.05 and 14.98 dB, respectively.

Spacing-adjustable and switchable multi-wavelength erbium-doped fiber laser using the filter of MMF-PMF-MMF based on PHB

“…Fiber lasers play a crucial role as light sources in wavelength-division multiplexed (WDM) fiber communication systems, as well as in optical detection and optical signal processing applications [1,2]. A wavelength-switchable fiber laser often proves more versatile and efficient than a fixed-wavelength fiber laser in various applications such as wavelength protection, optical measurement and wavelength routing [3,4].…”

Switchable emissions of an Erbium-doped fiber laser using cascaded MZIs based on CHCF

“…Alternatively, other investigations use two filters in cascade to achieve multiwavelength laser emissions [12][13][14][15][16]. Z. Tang et al [12] proposed two MZIs to obatain a single and dual-wavelength laser.…”

Highly Stable Switchable Emissions of an Erbium-Doped Fiber Ring Laser Using Cascaded MZIs Based on CHCF

“…On the other hand, several authors have proposed using two wavelength filters in a cascade configuration inside an EDFL, in a ring configuration, in order to obtain multiwavelength laser emissions with narrower linewidths, better stability, and higher SMSR [25][26][27][28][29][30]. For example, Z. Tang et al [25] manufactured two MZIs that were set in an EDFL to implement a single and dual-wavelength laser.…”