The effects of external optical feedback on the power penalty of DFB-LD modules for 2.5 Gb s(-1) optical transmission systems

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We report the effects of external optical feedback on the power penalty of commercial distributed feedback laser diode (DFB-LD) modules for 2.5 Gb s(-1) optical transmission systems. External optical feedback presented to the DFB-LD modules causes the excitation of external cavity modes, resulting in increased relative intensity noise (RIN) and intensity noise ripples at low frequency region below 500 MHz. For a 10(-10) bit error rate (BER), the minimum power penalty is as much as 1.25 dB for a feedback ratio of -8.8 dB. An excess power penalty of 0.5 dB per 3 dB increase in the feedback ratio was also empirically obtained. We suggest that optical isolators in 2.5 Gb s DFB-LD modules used in conventional optical transmission systems or WDM systems must have a peak isolation ratio of better than 54.5 dB, instead of the previously recommended 30 dB, for negligible power penalty induced by external optical feedback.
Publisher
SPRINGER
Issue Date
1998-01
Language
English
Article Type
Article
Keywords

SEMICONDUCTOR-LASERS; INTENSITY FLUCTUATION; DIODES; NOISE

Citation

OPTICAL AND QUANTUM ELECTRONICS, v.30, no.1, pp.23 - 31

ISSN
0306-8919
DOI
10.1023/A:1006910607553
URI
http://hdl.handle.net/10203/227529
Appears in Collection
EE-Journal Papers(저널논문)
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