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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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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description 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/.< >
doi_str_mv 10.1109/50.296186
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source IEEE Electronic Library (IEL) Journals
subjects Absorption
Chirp modulation
Fiber lasers
Frequency
Insertion loss
Laser feedback
Optical design
Optical fiber devices
Quantum well lasers
Reflectivity
title Optimization of DFB lasers integrated with Franz-Keldysh absorption modulators
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