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Proceedings Paper

Raman tilt and nonideal tilt control function of C-band erbium-doped fiber amplifiers
Author(s): Yihong Chen; Leda M. Lunardi; Daniel Al-Salameh; Stan Lumish
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Paper Abstract

Due to stimulated Raman scattering, shorter wavelength channels will pump longer wavelength channels, and so transfer their energy to longer wavelength channels. A tilt occurs when a flat DWDM signals travel through transmission fiber. We characterized the Raman tilt for 100 km SSMF and LEAF fiber at composite input powers ranging from 13 dBm to 22 dBm with a 40-channel laser source with 100 GHz spacing. Raman tilt with different fiber length at different composite launch power for SSMF is fully studied. In order to compensate the positive Raman gain tilt generated in the transmission fiber, a negative tilt is required. A tilt control function is available in some EDFAs. The mechanism of this tilt control is to use a tunable attenuator to change the internal loss of the amplifier. Unfortunately, the negatively tilted gain spectrum achieved by this mechanism is not a straight line. From the simulation result, the tilted gain curve actually can be regarded as two straight lines with a junction at about 1538 nm in good approximation. By combining the Raman output spectrum with the EDFA output spectrum, tilt is eliminated, but a non-flat spectral shape is generated with a dip at 1538 nm. This combined spectral shape agrees quite well with the measured spectral shape in actual system. This study reveals imperfection with this tilt compensation mechanism. A new tilt compensation solution is proposed and tested. Test results shown significant flatness improvement.

Paper Details

Date Published: 23 August 2002
PDF: 8 pages
Proc. SPIE 4906, Optical Components and Transmission Systems, (23 August 2002); doi: 10.1117/12.480569
Show Author Affiliations
Yihong Chen, JDS Uniphase Corp. (United States)
Leda M. Lunardi, JDS Uniphase Corp. (United States)
Daniel Al-Salameh, JDS Uniphase Corp. (United States)
Stan Lumish, JDS Uniphase Corp. (United States)

Published in SPIE Proceedings Vol. 4906:
Optical Components and Transmission Systems
WeiSheng Hu; Shoichi Sudo; Peter Kaiser, Editor(s)

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