An integrated coherent optical receiver circuit provided on a common substrate, suitable for polarization multiplexed quadrature phase-shift keying, comprising: a polarization beam splitter configured to receive a plurality of first optical signals and a plurality of second optical signals, each of the plurality of first optical signals having a corresponding one of a plurality of wavelengths, each of the plurality of second optical signals having a corresponding one of the plurality of wavelengths, the polarization beam splitter having a first output and a second output, the first output supplying the plurality of first optical signals and the second output supplying the plurality of second optical signals, further comprising, a first arrayed waveguide grating optical demultiplexer having an input and a plurality of outputs, the input of the first optical demultiplexer being configured to receive the plurality of first optical signals, and supply each of the plurality of outputs at a corresponding one of the plurality of outputs of the first demultiplexer; a second arrayed waveguide grating optical demultiplexer having an input and a plurality of outputs, the input of the second optical demultiplexer being configured to receive the plurality of second optical signals, and supply each of the plurality of outputs at a corresponding one of the plurality of outputs of the second optical demultiplexer; a first plurality of waveguides, each of which supplying a corresponding one of a first plurality of local oscillator signals; a second plurality of waveguides, each of which supplying a corresponding one of a second plurality of local oscillator signals; and a first plurality of optical hybrid circuits (1498, OHC), one of which receiving a portion of one of the plurality of first optical signals and a portion of one of the first plurality of local oscillator signals; and a second plurality of optical hybrid circuits (1499, OHC), one of which receiving a portion of one of the plurality of second optical signals and one of the second plurality of local oscillator signals. a polarization beam splitter configured to receive a plurality of first optical signals and a plurality of second optical signals, each of the plurality of first optical signals having a corresponding one of a plurality of wavelengths, each of the plurality of second optical signals having a corresponding one of the plurality of wavelengths, the polarization beam splitter having a first output and a second output, the first output supplying the plurality of first optical signals and the second output supplying the plurality of second optical signals, further comprising, a first arrayed waveguide grating optical demultiplexer having an input and a plurality of outputs, the input of the first optical demultiplexer being configured to receive the plurality of first optical signals, and supply each of the plurality of outputs at a corresponding one of the plurality of outputs of the first demultiplexer; a second arrayed waveguide grating optical demultiplexer having an input and a plurality of outputs, the input of the second optical demultiplexer being configured to receive the plurality of second optical signals, and supply each of the plurality of outputs at a corresponding one of the plurality of outputs of the second optical demultiplexer; a first plurality of waveguides, each of which supplying a corresponding one of a first plurality of local oscillator signals; a second plurality of waveguides, each of which supplying a corresponding one of a second plurality of local oscillator signals; and a first plurality of optical hybrid circuits (1498, OHC), one of which receiving a portion of one of the plurality of first optical signals and a portion of one of the first plurality of local oscillator signals; and a second plurality of optical hybrid circuits (1499, OHC), one of which receiving a portion of one of the plurality of second optical signals and one of the second plurality of local oscillator signals.