| Autor: |
Yidong Huang, Sato, Kenji, Okuda, Tetsuro, Suzuki, Naofumi, Ae, Satoshi, Muroya, Yoshiharu, Mori, Kazuo, Sasaki, Tatsuya, Kobayashi, Kenichi |
| Předmět: |
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| Zdroj: |
IEEE Journal of Quantum Electronics; Nov2002, Vol. 38 Issue 11, p1479, 6p, 8 Black and White Photographs, 2 Diagrams, 1 Chart, 10 Graphs |
| Abstrakt: |
This paper clarifies that phase shift value in directly modulated distributed feedback laser diodes (DFB-LDs) affects their chirp characteristics and resistance to external optical feedback because of the feedback effect of mirror loss (FEML). Comparing λ/8, λ/4, and 3λ/8 phase-shifted DFB-LDs, theoretically and experimentally, showed that the negative FEML in λ/8 phase-shifted DFB-LDs improves their transmission performance and makes them more resistant to external optical feedback. It was demonstrated with 2.5-Gb/s directly modulated 1.55-μm λ/8 phase-shifted DFB-LDs that a very low-power penalty for 100-km transmissions (less than 1 dB for BER = 10[sup -10]) can be obtained within a wide extinction ratio from 8.5 to 14.5 dB. Excellent resistance to optical feedback was also demonstrated using λ/8 phase-shifted DFB-LDs: isolator-free 80-km transmission was successful under -14-dB external optical feedback. In addition, the relation of transmission characteristics to coupling coefficient κL and detuning between oscillation wavelength and gain maximum was also discussed here for designing low chirp λ/8 phase-shifted DFB-LDs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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