Circuits and system simulations for 100Gb/s optical SCM transmission

All-Analogue Real-Time Broadband Filter Bank Multicarrier Optical Communications System

“…Later on, and in line with present requirements, frequency plans with a smaller number of broadband subchannels were reported [7,8]. Currently, the advances in high-speed analog-to-digital and digital-to-analog converters (ADC, DAC) have motivated the implementation of SCM schemes with hybrid analogue-digital processing [9,10]. Most importantly, spectral efficiency can be maximized by transmitting multiple orthogonally overlapping subchannels, like in orthogonal frequency division multiplexing (OFDM) [11].…”

“…Moreover, the baseband incoming signals have a data rate that is directly compatible with broadband RF IQ mixers [24], avoiding data rate changes and interfaces. The system architecture used here is based largely on amplifiers and IQ Mixers, allowing an integrated low cost low power implementation with monolithic microwave integrated circuit (MMIC) technology [10,25].…”

Optimum Bias Point in Broadband Subcarrier Multiplexing With Optical IQ Modulators

“…SCM can be combined with wavelength division multiplexing (WDM) to increase the flexibility of the network. Analogue and digital SCM approaches have been used in many applications, including cable television (CATV) [1], radio over fibre [2] also focusing on the increasingly important Common Public Radio Interface (CPRI) [3], broadband point to point links [4], access networks [5] and 100 Gbit/s local area networks [6]. In such a system it is desired to guarantee the following features: optical single side band (SSB) to increase spectral efficiency and eliminate dispersive fading [7], low inter channel distortion and an appropriate level of the optical carrier to optimize the sensitivity at the receiver.…”

Calculation of Receiver Sensitivities in (Orthogonal) Subcarrier Multiplexing Microwave-Optical Links

“…In contrast, ASP-based SCM systems rely on the maturity of microwave components, leveraging the excellent stability and frequency selectivity of microwave devices and the low phase noise of microwave oscillators, to potentially achieve broadband communications systems with low power consumption and low latency. Furthermore, all electrical ASP can be implemented with inexpensive monolithic microwave integrated circuit (MMIC) technology [4], benefiting from integration but with a reduced transistor count with respect to DSP. The main weakness of traditional broadband ASP-based SCM systems has been the spectral efficiency.…”