新型密集波分复用精确波长激光器

A Novel Dense Wavelength Division Multiplexing Laser Diode with Specific Wavelength

报道了一种新型外腔精确波长激光器。该器件由透镜光纤、单端增透的激光二极管(LD)芯片、准直透镜、窄带滤光片和高反镜依次级联而成,使用窄带滤光片作为选频和波长锁定元件。推导了该激光器的外腔等效反射率,简要分析了静态相关特性,给出了初步实验结果:窄带滤光片的插入损耗为0. 5 dB,自由光谱范围大于40 nm,谱线宽度小于1 7 nm。外腔激光器在较大的注入电流范围内实现了稳定的单纵模输出,阈值电流为25 mA,边模抑制比高达40 dB,输出波长符合国际电信联盟(ITU- T)建议的波长标称值。该器件具有制作简单、成本低廉等优点,特别适用于基于波分多址(WDMA)技术的以太网无源光网络(EPON)系统。

A novel external cavity laser with specific wavelength utili zi ng narrow-band-pass filter as wavelength selective component is presented. It consists of lensed fiber, semiconductor laser diode chip, collimating lens, narr ow-band-pass filter, and high reflectivity planar reflector in series. Static characteristics of the laser are analyzed. All the calculations are based on the rate equation and the effective reflection coefficients of the compound cavity of the external cavity laser. Experimental result shows that the narrow-band-p ass filter has the specifications with insertion loss about 0.5 dB, free spectr al range more than 40 nm and -3 dB bandwidth less than 1.7 nm. Good single mode operation of the external cavity laser over wide injected current range is obta ined with threshold current about 25 mA, side mode suppression ratio (SMSR) bett er than 40 dB. And the oscillation frequency of the laser can be emitted precise ly according to the ITU-T wavelength nominal value. For the excellent performan ce of this laser, it can be really used as promising light source for Ethernet p assive optical network (EPON) based wavelength division multiple access (WDMA).