Abstract
A 40 Gb/s multifunction optical format conversion module based on nondegenerate
four-wave mixing (ND-FWM) arising in a single semiconductor optical amplifier
(SOA) is proposed and demonstrated. It has the ability to achieve NRZ-OOK/DPSK/DQPSK
to CSRZ-OOK/DPSK/DQPSK, RZ-OOK/DPSK/DQPSK to CSRZ-OOK/DPSK/DQPSK, and CSRZ-OOK/DPSK/DQPSK
to RZ-OOK/DPSK/DQPSK format conversions. A comprehensive dynamic model to
investigate twelve FWM-related waves in SOA is presented. Using this model,
the proposed module with multiple format conversions is numerically investigated.
We find that the SOA based scheme can be used for high-speed all-optical multifunction
format conversion, because one of the FWM participators also serves as an
assist light to accelerate SOA gain recovery. Meanwhile three identical converted
signals with different wavelengths can be obtained simultaneously for all-optical
wavelength multicast application. Finally, the bit-error-rate (BER) measurements
of some 10 Gb/s operations are demonstrated in order to further verify the
proposed multifunction format conversion module. The power penalty is measured
to be less than 1 dB at the BER level of $10 ^{-9}$.
© 2009 IEEE
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