Widely Tunable Compact Monolithically Integrated Photonic Coherent Receiver

A monolithically integrated, photonic, dual polarization capable coherent receiver, with an on-chip widely tunable local oscillator laser is presented. A 20-Gb/s operation with nonreturn-to-zero-quadrature phase-shift-keyed signal, and local oscillator tuning over 40 nm of input wavelength span has been demonstrated.