Title :
Optimization of DFB lasers integrated with Franz-Keldysh absorption modulators
Author_Institution :
Ericsson Components AB, Stockholm, Sweden
fDate :
6/1/1994 12:00:00 AM
Abstract :
The influence of the residual facet reflectance on electroabsorption modulators monolithically integrated with DFB lasers is analyzed, for both index- and partly loss-coupled lasers. The optimum laser design is discussed from the standpoint of system requirements in long-distance 10 Gb/s transmission systems, requiring a minimum of chirp. The integrated device´s performance will depend as much on the laser design as on the modulator. The DFB laser should be long (L>500 μm) with a coupling strength of about κ·L=2-3 and should have a high relaxation oscillation frequency. The residual reflectance should be less than 1·10-4
Keywords :
distributed feedback lasers; electro-optical devices; electroabsorption; integrated optoelectronics; optical communication equipment; 10 Gbit/s; DFB lasers; Franz-Keldysh absorption modulators; coupling strength; electroabsorption modulators; index-coupled lasers; integrated device´s performance; long-distance transmission systems; optimum laser design; partly loss-coupled lasers; relaxation oscillation frequency; residual facet reflectance; residual reflectance; system requirements; Absorption; Chirp modulation; Fiber lasers; Frequency; Insertion loss; Laser feedback; Optical design; Optical fiber devices; Quantum well lasers; Reflectivity;
Journal_Title :
Lightwave Technology, Journal of
