23 October 2007 Design of wideband erbium doped fiber amplifier for WDM systems
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The present lightwave system prefers to operate near the 1550 nm region. Wideband optical fibers compatible with wavelength division multiplexing (WDM) transmission systems are available which can operate near 1550 nm region, but what basically limits the high transmission capacity is the slow response of the conventional semiconductor amplifiers. To overcome this researchers have devised the optical amplifier, commonly known as erbium doped optical amplifier (EDFA) which can directly amplify in the optical domain near 1550 nm region. Existing EDFAs are available with a relatively narrowband of 25nm centred nearly at 1550 nm. This development has motivated researchers to devise EDFA with broad bandwidth capabilities. In this paper, we present here a technique known as gain cascading of EDFA for designing wideband EDFA centred around 1550nm region. Gain cascading of two EDFAs pumped separately at 980nm and 1480nm combines the advantage of high gain characteristics of 980 nm pumping and broad bandwidth characteristics of 1480 nm pumping. By using pumping at 980nm, we observe that the peak value of gain is around 69dB and gain bandwidth is around 10-15nm. From pumping at 1480nm, it is observed that the peak value of gain has although decreased as compared to 980nm pumping but the gain bandwidth is increased to around 30-32nm. However, by cascading two EDFAs pumped separately at 980nm and 1480nm, the overall peak value of gain is increased to a very high value of around 180dB and bandwidth obtained is about 35 nm. We thus obtain a broader gain-bandwidth product by using gain cascading.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aditya Goel, Aditya Goel, Manjusha Goel, Manjusha Goel, "Design of wideband erbium doped fiber amplifier for WDM systems", Proc. SPIE 6675, Optical Modeling and Performance Predictions III, 66750L (23 October 2007); doi: 10.1117/12.732294; https://doi.org/10.1117/12.732294


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