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Proceedings Paper

External-reflection-resistant and low-chirp 1.55-um lambda/8 phase-shifted DFB-LDs for 2.5-Gb/s directly modulated isolator-free uncooled long-distance optical transponders
Author(s): Yidong Huang; Tetsuro Okuda; Kenji Sato; Yoshiharu Muroya; Tatsuya Sasaki; Kenichi Kobayashi
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Paper Abstract

This paper reported that, using a directly modulated lasers (DMLs) with a ?/8 phase-shifted distributed feedback (DFB) grating, isolator-free 2.5-Gb/s transmission over 138-km non-dispersion-shifted fiber (NDSF) was demonstrated with ?20-dB external optical feedback. The power penalty was 1.7 dB for a bit error rate (BER) of 10-10. Further potential for their low chirp characteristics was also demonstrated by error-free transmission over 200 km without optical feedback. Uncooled transmission performance at 80°C was also investigated. A low power penalty of less than 1.0 dB for a BER of 10-10 was obtained in transmission over 60 km. The good experimental results are due to the characteristics of low chirp and optical feedback resistance that originate from the negative feedback effect of mirror loss (FEML) in ?/8 phase shifted DFB-LDs. Also discussed in this paper is the design of coupling coefficient ?L and of detuning ?? between oscillation wavelength and gain maximum since these parameters strongly affect the DMLs’ transmission characteristics.

Paper Details

Date Published: 5 September 2002
PDF: 8 pages
Proc. SPIE 4913, Semiconductor Lasers and Applications, (5 September 2002); doi: 10.1117/12.482198
Show Author Affiliations
Yidong Huang, NEC Corp. (Japan)
Tetsuro Okuda, NEC Corp. (Japan)
Kenji Sato, NEC Corp. (Japan)
Yoshiharu Muroya, NEC Corp. (Japan)
Tatsuya Sasaki, NEC Corp. (Japan)
Kenichi Kobayashi, NEC Corp. (Japan)

Published in SPIE Proceedings Vol. 4913:
Semiconductor Lasers and Applications
Yi Luo; Yoshiaki Nakano, Editor(s)

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