Abstract
The impact of optical receiver configuration on in-band crosstalk-induced
penalty has been investigated in both theoretical and experimental analyses, for
differential phase-shift keying (DPSK) and differential quadrature phase-shift
keying (DQPSK) signals. Previously it has been shown that DPSK signals are ~6 dB
more tolerant to in-band crosstalk than on-off keying (OOK) signals. However, we
find that the tolerance difference between the two signals is reduced to ~3 dB when
the decision threshold of the receiver is optimized to minimize the bit-error rate
for each signal. Then we derive simple equations for the in-band crosstalk-induced
penalty in DPSK and DQPSK signals with two different optical receiver
configurations: balanced and single-ended direct-detection receivers. We confirm
that the penalties obtained from our simple equations agree well with the measured
results.
© 2016 Optical Society of Korea
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