Abstract
We propose and demonstrate a novel four-channel monolithic
polarization-diversity dual-quadrature coherent receiver with balanced
detection in InP. It uses an interleave-chirped arrayed waveguide grating
that acts simultaneously as a demultiplexer, four polarization splitters,
and four 90$^{\circ}$ hybrids. There are no waveguide crossings, and the polarization
extinction ratio is ${>} $21 dB and the hybrid phase error magnitude is ${<} 1^{\circ}$ without any post-fabrication adjustments. We demonstrate 4$\,\times\,$43-Gb/s reception.
© 2011 IEEE
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