Multi-wavelength Brillouin-Raman fiber laser utilizing enhanced nonlinear amplifying loop mirror design

Abstract

We demonstrate a single-spacing, multi-wavelength Brillouin-Raman fiber laser utilizing an enhanced cavity of nonlinear amplifying loop mirror. In this structure, the optimization of multi-wavelength lasing is done with proper adjustments of coupling ratio and Brillouin pump power. When setting the Raman pump power to 300 mW, up to 28 channels with an average 17 dB optical signal-to-noise ratio are achieved. In this case, the Brillouin pump power is maintained at -2.6 dBm when the splitting ratio and Brillouin pump wavelength are fixed at 99/1 and 1555 nm, correspondingly. Our achievements present high numbers of Stokes channels with an acceptable optical signal-to-noise ratio at low pump power operation.

Enhancing performance of multiwavelength Brillouin–Raman fiber laser by capturing residual pump power

“…The BP source is used to initiate the Brillouin cascaded process based on the SBS phenomenon [11], whereas the Raman pump source is used to convert the optical fiber from loss medium to gain medium based on the SRS phenomenon [12]. Several studies have examined the importance of the effect of Raman pump power (RPP) and Brillouin pump power (BPP) on the performance parameters of the MBRFL system [13][14][15][16]. These studies reported that the RPP affects the MBRFL performance parameters in terms of the intensity of Brillouin Stokes lines (BSLs), power level fluctuations between neighboring channels, flatamplitude bandwidth, optical signal-to-noise ratio of the generated channels, and the SBS threshold power.…”

Multi-wavelength fiber lasers operated in stretched-pulse mode-locked regimes with a very compact configuration

“…The group velocity dispersions (GVD) of the EDF and SMF are 61.2 ps 2 km −1 and −22.9 ps 2 km −1 , respectively. The total GVD of this cavity is estimated to be +0.008 ps 2 ± 0.006 ps 2 , which reveals that it is operating in the stretched-pulse regime. In this scheme, we utilize a single PC instead of the PC-PDI-PC sandwich structure to accomplish mode-locking and wavelength filtering.…”

“…Multi-wavelength erbium-doped fiber lasers (EDFLs) have attracted intensive interest due to their potential application in wavelength division multiplexed (WDM) fiber-communication systems, optical fiber sensors, optical instrument testing and THz generation. Various methods have been employed to realize room-temperature multi-wavelength fiber lasers such as introducing four-wave mixing in nonlinear fibers [1], exploiting Brillouin-Raman or Brillouin-erbium fiber lasers [2,3], utilizing the polarization hole burning effect in gain media [4] or a frequency-shifted feedback technique in a laser cavity [5], employing high nonlinear fibers [6,7] and so forth. On the other hand, to attain multi-wavelength operation, a multi-channel filter should usually be used, including a fiber Bragg grating based Fabry-Perot (FP) filter [8], a twin-core fiber-based Mach-Zehnder interferometer [9], Sagnac loop mirrors with polarization-maintaining fiber (PMF [10]), or a birefringence fiber filter [11].…”

Soliton molecules in a fiber laser mode-locked by a graphene-based saturable absorber

“…Erbium-doped fiber (EDF) lasers have attracted a great deal of research interest due to their wide applications in fiber sensors and communications [1][2][3][4][5][6][7][8][9]. They can deliver a continuous wave (e.g.…”