WIDELY TUNABLE SG-DFB LASER DIODE IN WHICH WAVELENGTH IS WIDELY VARIED ACCORDING TO VARIATION OF REFRACTIVE INDEXES OF PHASE CONTROL REGIONS

摘要

PURPOSE: A widely tunable SG-DFB(Sampled Grating-Distributed FeedBack) laser diode oscillated according to a variation of refractive indexes of phase control regions is provided to enhance the optical efficiency by connecting directly optical waves of a gain region to an optical fiber without loss. CONSTITUTION: A widely tunable SG-DFB laser diode includes a first gain region and a second gain region. The widely tunable SG-DFB laser diode further includes a first SG-DFB structure and a second SG-DFB structure. The first SG-DFB includes a first sampled grating(34a) of a first period formed on the first gain region and a first phase control region(35a) formed between the first sampled gratings. The second SG-DFB includes a second sampled grating(34b) of a second period formed on the second gain region and a second phase control region(35b) formed between the second sampled gratings.