Abstract
An erbium-doped fiber amplifier (EDFA) for S-bandsignal amplification is designed by using a depressed claddingerbium-doped fiber (DC-EDF). The fiber's characteristics aredescribed in terms of the effects of the fiber spooling diameteron the amplifier's performance. In this experiment, the spoolingdiameter required for optimum amplifier gain was around 5–7 cm.By using a typical two-stage configuration (with a 27 m longDC-EDF and a 260 mW pump laser power), the maximum small signalgain obtained was about 32 dB. Yet, by employing a double passamplifier configuration with a shorter DC-EDF length and a lowerpump laser power (15 m and 135 mW, respectively), a similarmaximum small signal gain of approximately 30 dB was achieved.This improvement in gain characteristics however, incurred anincreased noise figure penalty of about 1 dB in comparison tosingle-pass amplifier configurations. In order to reduce theamplifier's noise figure while maintaining its high gain, apartial double-pass S-band EDFA configuration was introduced. Thisconfiguration provides a high 26.9 dB gain and an improved noisefigure comparable to a single pass configuration. Gain clamping inS-band EDFAs are also demonstrated by utilizing a fiber Bragggrating to form an oscillating laser at around 1530 nm. Thistechnique enables good gain clamping with a gain variation of lessthan 1 dB.
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