Abstract
The digital coherent receiver, which is a combination of a phase-diversity
optical homodyne receiver and digital signal processing (DSP), can demodulate
any multilevel coded optical signals without relying upon an optical phase-locked
loop. However, the maximum symbol rate processed by such a receiver is limited
by the speed of electric analog-to-digital converters and digital signal processors.
Although real-time operation at 10 Gsymbol/s using an application-specific
integrated circuit has recently been demonstrated, it is still difficult to
increase the symbol rate beyond 40 Gsymbol/s. In order to cope with this difficulty,
we propose a novel scheme, which employs a local oscillator (LO) pulsed at
the subharmonic frequency of the symbol rate, enabling time-division demultiplexing
of the signal at the digital coherent receiver. We demonstrate that the new
type of digital coherent receiver operating at 10 Gsymbol/s can demodulate
the aggregate symbol rate of 160 Gsymbol/s. From these results, we can expect
ultrafast coherent optical fiber communication in the future.
© 2009 IEEE
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