Abstract
This chapter is focused on the discussion of coherent detection techniques of optic communication. By mixing with a strong optical local oscillator (LO), the optical signal is effectively magnified at the receiver, and coherent detection also allows the complex field of the optical signal to be recovered. Because the LO has much higher optical power than the optical signal, we show that signal-to-noise-ratio (SNR) calculation in a coherent receiver is quite different compared to a system based on direct detection. Various techniques used in coherent detection receivers are discussed, including homodyne and heterodyne detection, balanced detection, phase diversity and polarization diversity, and in-phase/quadrature (I/Q) detection.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
