时分副载波半导体DFB激光多路波长锁定器

我们研制成功8路时分副载波半导体DFB激光器波长锁定器.用1kHz正弦时分电信号,分别对8个1.55μm波段的DFB激光器进行1％的幅度调制,每个DFB激光2％的光信号分成两路,一路通过自由光谱区为100 GHz的F-P标准具,另一路作参考光,两路的光电差分信号反馈控制DFB激光器的温度,使每个DFB激光器锁定在各自所需的波长上.测试结果表明波长锁定的激光频率间隔100 GHz,波长锁定精度优于±2.5GHz。该方法同样适用于50GHz频率间隔和更多路的波长锁定.本文着重介绍该锁定器的光电信号处理和控制方法.

Time Division Sub-carrier Semiconductor DFB Laser Multi-wavelength Locker

We have successfully developed an 8 channels time division sub-carrier semiconductor DFB laser wavelength locker. We use 1 kHz sinusoidal time division electric signal and 1% AM degree to modulate every 1.55μm waveband DFB laser respectively. 2% optic signal of each DFB laser is divided into two parts, one part passing through a F-P etalon whose free spectral range is 100 GHz and another as reference signal. Optic electric differential signal of two paths feedback controls DFB lasers' temperature in order to make each DFB laser lock at the wavelength they are needed respectively. Test results show that the laser frequency spacing of wavelength-lock is 100 GHz and wavelength-lock accuracy is better than±2.5 GHz. This method can also be used in 50 GHz frequency spacing and more channels of multi-wavelength locker. This paper mainly introduces the optic and electric process and control method of the locker.