Title :
TM mode suppression property of DFB lasers with a narrow stripe region
Author :
Matsuyama, Takayuki ; Makuta, Akio ; Tanaka, Akira ; Ohtsuka, Kazuaki ; Agatsuma, Hiroyuki ; Kinoshita, Junichi
Author_Institution :
Toshiba Electron. Device Eng. Corp., Yokohama, Japan
Abstract :
The TM-mode suppressibility of DFB lasers with a narrow stripe region is investigated. A waveguide is designed to produce different phase shifts between the TE and TM modes. A threshold gain difference between the TE and TM modes is introduced by a phase shift difference of both modes. A TM and side mode suppression ratio of more than 40 dB is obtained under 1.8-Gb/s NRZ pseudorandom pulse modulation.<>
Keywords :
distributed feedback lasers; laser modes; optical waveguides; semiconductor junction lasers; DFB lasers; NRZ pseudorandom pulse modulation; TM mode suppression; laser mode phase shifts; narrow stripe region; nonreturn-to-zero; phase shift difference; phase shifts; semiconductor lasers; side mode suppression ratio; threshold gain difference; waveguide; Fiber lasers; Laser modes; Light sources; Optical fibers; Optical signal processing; Optical waveguides; Planar waveguides; Pulse modulation; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
