Coherent Communication – Digital and Optical Signal Processing

Stupendous increase in demand for capacity in optical fiber communication has resulted in a very quick adaptation of coherent communication, where the data is modulated in amplitude and phase and is also multiplexed in wavelength, polarization and space. Digital signal processing of the received data has become indispensable in coherent communication to correct for impairments originating in the transmitter, channel and receiver. The nature of these algorithms change for higher signaling rates, increased constellation order and in space division multiplexing. In this talk, we will present some of the joint impairment compensation algorithms for higher order modulation formats and in space division multiplexing. We also present some optical signal processing schemes that would augment the digital signal processing for advanced modulation formats, thereby improving the energy efficiency of the system.