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Alternating cascade of spectrally different erbium-doped fiber amplifiers for link-loss-insensitive long-haul WDM transmission

Alternating cascade of spectrally different erbium-doped fiber amplifiers for link-loss-insensitive long-haul WDM transmission
Alternating cascade of spectrally different erbium-doped fiber amplifiers for link-loss-insensitive long-haul WDM transmission
This paper numerically investigates a cascade of erbium-doped fiber amplifiers (EDFA's) with different spectral characteristics in an alternating scheme. Thereby, in a transmission band with appropriate spectral properties (1544-1550 nm), the sensitivity of optically amplified long-haul WDM transmission links on the span loss between amplifiers can be reduced to that of single-channel systems. This may be as much as an order of magnitude better than in a traditional, nonalternating, WDM cascade. While passive bandpass filters are necessary to control the wavelength range, there is no need for any active gain equalization or feed-back control. The gain in the cascade can also to some extent automatically adjust to compensate for a spectral tilt of the loss, We show that the range of this automatic loss tilt compensation can be increased, up to three times its original value, by enhancing the difference of the net gain that signals at different wavelengths experience in EDFA's of different types.
0733-8724
434-444
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Jaskorzynska, B.
e15d41e4-b800-4e89-82e3-47774f1d456e
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Jaskorzynska, B.
e15d41e4-b800-4e89-82e3-47774f1d456e

Nilsson, J. and Jaskorzynska, B. (1999) Alternating cascade of spectrally different erbium-doped fiber amplifiers for link-loss-insensitive long-haul WDM transmission. IEEE Journal of Lightwave Technology, 17 (3), 434-444. (doi:10.1109/50.749383).

Record type: Article

Abstract

This paper numerically investigates a cascade of erbium-doped fiber amplifiers (EDFA's) with different spectral characteristics in an alternating scheme. Thereby, in a transmission band with appropriate spectral properties (1544-1550 nm), the sensitivity of optically amplified long-haul WDM transmission links on the span loss between amplifiers can be reduced to that of single-channel systems. This may be as much as an order of magnitude better than in a traditional, nonalternating, WDM cascade. While passive bandpass filters are necessary to control the wavelength range, there is no need for any active gain equalization or feed-back control. The gain in the cascade can also to some extent automatically adjust to compensate for a spectral tilt of the loss, We show that the range of this automatic loss tilt compensation can be increased, up to three times its original value, by enhancing the difference of the net gain that signals at different wavelengths experience in EDFA's of different types.

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More information

Published date: 1999
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 77802
URI: http://eprints.soton.ac.uk/id/eprint/77802
ISSN: 0733-8724
PURE UUID: db632a04-8d40-44c6-b7b1-cdcdb27e4f82
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

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Date deposited: 11 Mar 2010
Last modified: 07 Oct 2020 01:42

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Author: J. Nilsson ORCID iD
Author: B. Jaskorzynska

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