Abstract
We demonstrate a considerable enhancement of input power dynamic range
(IPDR) for multiwavelength amplification and optical signal processing in a
semiconductor optical amplifier (SOA) by using holding beam effect. The
effect is used in SOA gain region at power level well below 10 dBm, which is
much smaller than the required power as the setting at transparency
wavelength. The IPDR is extended not only to high power range due to the
reduction of nonlinear crosstalks, but also to low power range due to the
compression of amplified spontaneous emission (ASE) noise. The technique is
first applied to the amplification of wavelength-division multiplexed (WDM)
channels using a continuous wave (CW) holding beam. The holding beam is
particularly useful for the amplification of large number of channels thanks
to the suppression effect of interactions among WDM channels. It is then
carried out for one of extensively-used optical processing schemes,
terahertz optical asymmetric demultiplexer (TOAD), for multiwavelength data
format conversion without the need of an external CW light. The IPDR of TOAD
reaches over 20 dB as control clock behaves simultaneously as the holding
beam. We also present that the patterning effect and the impact of ASE noise
on the converted signal are strongly dependent on the TOAD's switching
window, which is optimized at 40% duty ratio for the largest IPDR.
© 2010 IEEE
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