宽带可调谐双频移多波长布里渊光纤激光器

提出了一种采用高非线性光纤作为布里渊增益介质 的双倍布里渊频移间隔的多波长布里渊光纤激光器(MW-BEFL)。激光器利用两个环形器构成 双倍频移结构,将奇数阶的斯托克斯信号隔离在腔内循环,仅有泵浦 信号和偶数阶的斯托克斯信号能够耦合输出,实现了双倍布里渊频移的多波长输出。激光器 腔内没有引入 任何的有源增益介质对斯托克斯信号进行放大,消除了腔内自激模的影响。激光器的调谐范 围由布里渊泵 浦的工作波长和掺铒光纤放大器(EDFA)的增益带宽决定。实验中,在布里渊 抽运 功率为0dBm、EDFA的输出功率为20 dBm的情况下,在1536~1605nm之间得到双频移间隔的多 波长输出,调谐范围是69nm。

Widely tunable multi-wavelength Brillouin fiber laser with double Brillouin frequency spacings

A simple technique for achieving tunab le multi-wavelength Brillouin fiber laser(BFL) with double Brillouin frequen cy spacings is experimentally demonstrated,by utilizing a piece of 200m-long highly nonlinear fiber as the Brillouin gain medium.Two three-port circulators are incorporated in the laser configuration to circulate the odd-order Brillouin St okes in the cavity and couple out the initial Brillouin pump and even-order Stokes,which provides the multi-wavelength output with double Brillouin frequency spacings.An advantage of this scheme is that it does not use any active gain medium in the cavity for amplification of S tokes signals, which realizes the wideband tunable laser by eliminating the influence of the se lf-lasing cavity modes.The turning range of the proposed laser totally depends on the working wa velength of the tunable laser and the gain profile of the erbium-doped fiber amplifier (EDFA).A t the Brillouin pump power of 0dBm and the EDFA output power of 20dBm,multi-wavelength with double Brillouin frequency spacings which can be tuned from 1536nm to 1605nm can be achieved.