SAMPLED-GRATING DISTRIBUTED-FEEDBACK LASER DIODE WIDELY TUNABLE

摘要

PROBLEM TO BE SOLVED: To obtain a structure which can give a high optical efficiency and is widely tunable, has a simple structure in comparison with the conventional wavelength tunable laser diode and is advantageous in mass production.;SOLUTION: In a sampled-grating distributed-feedback laser diode having a wide-band variable wavelength, there are so integrated in two different first and second regions from each other (first and second SG-DFB structure portions) first and second sampled gratings 34A, 34B having respectively first and second periods Z_O, Z'_O that each first phase controlling region 35A is inserted between active layers 33 of the first region and each second phase controlling region 35B is inserted between active layers 33 of the second region. By varying the refractive indexes of the phase controlling regions 35A, 35B provided respectively in the first and second regions, the wavelength of the outputted laser can be varied over a wide scope continuously/incontinuously.;COPYRIGHT: (C)2005,JPO&NCIPI