Abstract
Semiconductor optical amplifiers (SOA) have attracted significant attention recently due to its compactness and potential low cost. Multi-span DWDM transmission tests have been conducted using SOA as inline amplifiers.1–5 It is becoming a very competitive device for low cost optical network systems such as regional metro network. Two major drawbacks limited application of this device, they are: limited output power and sever crosstalk when operated in saturation region.Due to these reasons, previous multi-span tests shown a typical span length 40–50 km. Raman fiber amplifier, Due to its superior noise performance and distributed nature, has been regarded as an ideal candidate for improving optical signal-to-noise ratio and expending span length.6 Raman amplification has been used alone or with EDFAs for high bit-rate and ultra long haul transmission.
© 2002 Optical Society of America
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