设计了一种结构简单的波长间隔双倍布里渊频移的可调谐多波长布里渊/铒光纤激光器。利用一个3 dB耦合器形成复合环形腔结构，使奇数阶斯托克斯信号被局限在一个腔内循环，仅有初始布里渊抽运信号和偶数阶的斯托克斯信号能够耦合输出，实现了波长间隔双倍布里渊频移的多波长输出。分析了不同布里渊抽运功率、不同980 nm抽运功率下激光器的输出特性。在布里渊抽运信号功率10 dBm，980 nm抽运功率110 mW的情况下，激光器在1555~1565 nm范围内获得了波长间隔0.176 nm的6个波长输出。

A tunable multiwavelength Brillouin/erbium fiber laser with double-Brillouin-shift spacing is experimentally demonstrated. The compound ring cavity configuration formed by a 3 dB coupler confines the odd-order Stokes signals to circulate in a cavity and provides the initial Brillouin pump and even-order Stokes signals to be coupled out. Then multiwavelength outputs with double-Brillouin-shift spacing are achieved. The output characteristics of the fiber laser are analyzed under different Brillouin pump powers and 980 nm pump powers. At the Brillouin pump power of 10 dBm and the 980 nm pump power of 110 mW, 6 output channels with 0.176 nm channel spacing from 1555 nm to 1565 nm are achieved.