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

doi:10.1023/A:1006910607553

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 journal › Article › peer-review

13 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 language	English
Pages (from-to)	23-31
Number of pages	9
Journal	Optical and Quantum Electronics
Volume	30
Issue number	1
DOIs	https://doi.org/10.1023/A:1006910607553
Publication status	Published - 1998

ASJC Scopus subject areas

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

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

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.",

author = "Park, {K. H.} and Lee, {J. K.} and Han, {J. H.} and Cho, {H. S.} and Jang, {D. H.} and Park, {C. S.} and Pyun, {K. E.} and Jichai Jeong",

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AU - Park, K. H.

AU - Lee, J. K.

AU - Han, J. H.

AU - Cho, H. S.

AU - Jang, D. H.

AU - Park, C. S.

AU - Pyun, K. E.

AU - Jeong, Jichai

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

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

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