Optimization of DFB lasers integrated with Franz-Keldysh absorption modulators

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 transmissio...

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Bibliographic Details
Published in:Journal of lightwave technology 1994-06, Vol.12 (6), p.969-976
Main Author: Sahlen, O.
Format: Article
Language:English
Subjects:
Absorption
Chirp modulation
Fiber lasers
Frequency
Insertion loss
Laser feedback
Optical design
Optical fiber devices
Quantum well lasers
Reflectivity
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Summary: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 /spl mu/m) with a coupling strength of about /spl kappaspl middot/L=2-3 and should have a high relaxation oscillation frequency. The residual reflectance should be less than 1/spl middot/10/sup -4/.< >
ISSN:0733-8724
1558-2213
DOI:10.1109/50.296186