Control of the lasing wavelength by a sampled grating in a complex-coupled DFB laser

The lasing wavelength of a complex-coupled DFB laser is controlled by a sampled grating. The key concepts of the approach are to utilize the -1st order (negative first order) reflection of a sampled grating for laser single mode operation, and use conventional holographic exposure combined with the usual photolithography to fabricate the sampled grating. The typical threshold current of the sampled grating based DFB laser is 32 mA, and the optical output is about 10 mW at an injected current of 100 mA. The lasing wavelength of the device is 1.5356 mu m, which is the -1st order wavelength of the sampled grating.

National 863 project 2007AA03Z417 2006AA01Z256 2007AA03Z419 National 973 Program of China 2006CB604901 2006CB604902 National Natural Science Foundation of China 90401025 607360366070600960777021The authors would like to thank BaoJun Wang, Fan Zhou, JiaoQing Pan, HuiYun Shu for their experimental help, and LuFeng Wang, Jing Bian, Xin An for their support on the device test. This work is supported in part by the National 863 project (Grant Nos. 2007AA03Z417, 2006AA01Z256, 2007AA03Z419), in part by the National 973 Program of China (Grant No. 2006CB604901, 2006CB604902) and in part by the National Natural Science Foundation of China (Grant Nos. 90401025, 60736036, 60706009, 60777021).