Abstract
A synthesizer-free architecture for 10 Gbit/s return-to-zero binary
phase-shift keying (RZ-BPSK) data generation and transmission is demonstrated
by using an integrated DFBLD and electro-absorption modulator (EAM) link based
self-starting optoelectronic oscillator (OEO). The effects of EAM offset bias
and modulation amplitude on the RZ carrier characteristics are numerically
simulated. Optimizing the operating parameters of EAM shortens the RZ pulsewidth
to 25 ps and enhances the on/off extinction ratio (ER) up to 8.4 dB. Detuning
the DPSK demodulator bias to match the frequency comb spacing with the RZ
carrier frequency further improves the transmission performance of the clock-free
RZ-BPSK data-stream. When comparing with a synthesizer based RZ-BPSK data
generator, the receiving sensitivity of the proposed system can achieve ${-}17.7$dBm
at BER of $10^{-9}$ with power penalty improving by 2.5 dB.
© 2011 IEEE
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