Title :
Coherent transmission using an external waveguide Bragg reflector laser with direct frequency modulation
Author :
Olsson, N.A. ; Johnson, B.H. ; Lee, Hyung Jong ; Henry, C.H. ; Kazarinov, R.F. ; Ackerman, D.A. ; Anthony, P.J.
Author_Institution :
AT&T Bell Laboratories, Murray Hill, USA
Abstract :
Single-frequency l.5¿m semiconductor lasers, formed by butt-coupling of a regular Fabry¿Perot laser to an external waveguide Bragg reflector, are shown to have very uniform frequency modulation characteristics under direct current modulation. The laser´s frequency modulation characteristics, together with its narrow linewidth (¿ 1 MHz), make coherent transmission possible without external modulators. The laser performance was evaluated in a 417Mbit/s, 102 km, frequency-shift-keying coherent transmission experiment.
Keywords :
distributed Bragg reflector lasers; frequency modulation; frequency shift keying; laser cavity resonators; laser transitions; optical communication equipment; optical fibres; optical links; optical modulation; optical waveguides; semiconductor junction lasers; spectral line breadth; 1.5 micron; 102 km; 417 Mbit/s; Bragg reflector; FSK; Fabry-Perot laser; butt-coupling; coherent transmission experiment; direct current modulation; direct frequency modulation; external waveguide; frequency-shift-keying; narrow linewidth; optical links; semiconductor lasers; single frequency type; single-mode optical fibre;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19870490
