Balanced optical receivers available from Lastek have been demonstrated to improve link sensitivity by 3 dB or more in applications such as DPSK, differential phase shift keying, and DQPSK, differential quadrature phase shift keying.
In DPSK detection the phase of the optical signal is compared with a one bit delayed version of bit stream after passing through an optical interlever.
The advantage versus OOK modulation is in the 100% duty cycle possible with balanced detection.
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