Optical performance monitoring (OPM):OPM is a new era of digital monitoring technology that is used for optical communication to improve the quality of transmission and quality of service.OPM mainly focuses on measuring and controlling the optical signal quality during transmission.OPM has mainly three layers of monitoring. They are represented as: Important Notes:Some important parameters need to be monitored in optical communication:WavelengthPower levelOptical signal to noise ratio (OSNR)Quality factorBit-error rate (BER)Chromatic dispersionSignal jitterState of polarizationNonlinear distortion