Stable double spacing multiwavelength Brillouin-Erbium doped fiber laser based on highly nonlinear fiber

Abstract

A double frequency spaced multiwavelength Brillouin-Erbium doped fiber laser (BEDFL) with figure of eight cavity have been successfully developed and tested. Double frequency spacing is achieved by using a piece of 2 km of highly nonlinear fiber (HNLF) as a gain medium. Figure of eight configuration removes the odd order Stokes signals via a four port circulator. Fifteen Stokes channels are simultaneously generated with a spacing of 0.154 nm that is around 20 GHz, when the Brillouin pump and 980 nm pump powers are fixed at the optimized values of 6 dBm and 40 mW, respectively. Fourteen anti stoke channels are also obtained, which are generated through four wave mixing (FWM) process in the laser cavity. The output is smooth triangular comb. The BEFL can also be tuned from 1526.5 to 1567.5 nm.

Double spacing multi-wavelength L-band Brillouin erbium fiber laser with Raman pump

“…The anti-Stokes generation is mainly due to the FWM effect. The number of lines is improved as compared to the previous work [17], which uses a 980 nm pump and operates in the C-band region. It is observed that all the odd-order Stokes signals (that have a small peak between desired channels) also appear at the output spectrum.…”

“…It consists of a double Brillouin frequency shifter (DBFS) and a ring EDF laser cavity. The DBFS is the principal structure of this BEFL, which consists of a spool of 2 km long HNLF and four-port optical circulator to provide frequency down shift of 0.16 nm depending on the material texture of the optical fiber [17]. Tunable Brillouin pump (BP) power is supplied by tunable laser source (TLS) with a maximum output power of 8 dBm ($6 mW), which is pumped into the ring cavity by using a four-port directional coupler (DC), with coupling ratio of 80:20.…”

Torsion sensor based on a figure-of-eight cavity fibre laser

“…Optical fibre lasers with a figure-of-eight configuration have been reported for multi-wavelength emission using both erbium-doped fibre [3] and erbium-ytterbium co-doped fibre [4][5][6] as the gain medium. The inclusion of an optical filter in the loop can be decisive in achieving good output stability [7].…”

AQ-switched multi-wavelength Brillouin erbium fiber laser with a single-walled carbon nanotube saturable absorber

“…However, channel spacing of 0.08 nm is not practical for DWDM applications, as it is difficult to demultiplex the channels at the receiver end. Therefore, many works on multi-wavelength BFLs with double Brillouin spacing (DBS) of around 0.16 nm have also been reported [16]. In this paper, a Q-switched multi-wavelength Brillouin erbium fiber laser (BEFL) is demonstrated, based on SWCNTbased SA.…”