Abstract
Dynamic-single-mode (DSM) semiconductor lasers are a new class of lasers operating in only one single-mode even under rapid direct modulation, and it is believed to be a very attractive light source which creates wide band fiber communications at the lowest-loss wave-length of 1.5 to 1.6 µm. From among various possibilities of achieving the DSM property, distributed-Bragg-reflector (DBR) integrated lasers and distributed-feed-back (DFB) lasers have been realized. In this paper, lasing properties of GalnAsP/InP buried heterostructure DBR lasers emitting in 1.5 to 1.6 µm wavelength region are given. Stable single-mode oscillation under high frequency direct modulation up to 3 GHz was observed in these lasers and dynamic spectral width which under high speed modulation was measured to be less than 0.3 nm. Room temperature CW operation of BH-Butt-Jointed Built-in (BJB)-DBR lasers was obtained with the output power of a few mW. A possibility of wide-band and low-loss single-mode fiber transmission in the wavelength of 1.55 µm is suggested with the estimated band-width of 185 Gbit/s·km. Variety of application of DSM lasers is further considered.
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