The effects of external optical feedback on the power penalty of DFB-LD modules for 2.5 Gbs-1 optical transmission systems

K. H. Park, J. K. Lee, J. H. Han, H. S. Cho, D. H. Jang, C. S. Park, K. E. Pyun, Jichai Jeong

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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 SdB increase in the feedback ratio was also empirically obtained. We suggest that optical isolators in 2.5 Gb s-1 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.

Original languageEnglish
Pages (from-to)23-31
Number of pages9
JournalOptical and Quantum Electronics
Volume30
Issue number1
DOIs
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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