Abstract
We propose, characterise and demonstrate a photonic multistage switching
circuit operating at 160 Gb/s serial line rates. The circuit is realised on
a re-grown active-passive wafer exploiting multiple stages of
loss-compensating semiconductor optical amplifier crossbar switch elements.
Excellent 40 dB crosstalk extinction is achieved, with signal to noise
ratios of up to 39 dB/0.06 nm. Low loss circuit operation is presented, with
the prospect of gain if antireflection coatings are applied at the input and
output facet.Bit error rate studies show only modest levels of signal degradation under
both static and dynamic operation. For static operation, power penalties of
0.6 dB and 1.2 dB are measured for two and four switch stages respectively.
Dynamic switching is demonstrated with a power penalty of order 2.2 dB.The combined demonstration of a multistage monolithic photonic circuit and
high line rate signal processing represents an important milestone towards
ultrahigh data density optoelectronic signal processing.
© 2010 IEEE
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