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Gain-clamping in two-stage L-band EDFA using an unwanted backward ase from second stage

✍ Scribed by S.W. Harun; H. Ahmad

Book ID
104159830
Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
171 KB
Volume
35
Category
Article
ISSN
0030-3992

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✦ Synopsis

A gain clamping technique for the long wavelength band erbium-doped ÿber ampliÿer (L-band EDFA) is presented. It uses two circulators and a broad band ÿber Bragg grating to route wasted backward C-band ASE from the second stage and launch it back into the input end of the ÿrst stage of a two-stage ampliÿer. The two-stage L-band EDFA has shown a small signal gain improvement of 5:7 dB compared to a single-stage ampliÿer with a slight noise ÿgure degradation. By utilizing the wasted backward ASE, a L-band gain-clamped EDFA with high gain can be realized. Compared to the unclamped case, this gain-clamping technique is e ective in reducing the total gain variation as small as 0:3 dB.

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