title: Rayleigh backscattering noise suppression based on real-time heterodyne receiver for loop-back WDM-PON.
abstract: In this paper, we propose a Rayleigh backscattering (RB) noise mitigation scheme based on the use of real-time heterodyne receiver for loop-back wavelength division multiplexing passive optical network (WDM-PON). Heterodyne detection has been utilized to increase the upstream receiver sensitivity, while an electro-absorption modulator (EAM) is used to simultaneously turn heterodyning bipolar signal into single polar signal and mitigate accumulated carrier RB noise. With the help of the nonlinear negative-slope transfer function of EAM, low frequency interference noise is suppressed successfully. RB noise mitigation performance is studied over 45-km single mode fiber (SMF) transmission, and the optical-signal-to-Rayleigh-noise-ratio (OSRNR) is reduced to 15.6 dB, when bias voltage of EAM is at -4 V. Through utilizing this real-time heterodyne receiver in single fiber loop-back structure, upstream error free transmission is realized with receiver sensitivity of -25 dBm.
authors.forename: Hanlin
authors.initials: H
authors.lastname: Feng
authors.forename: Shilin
authors.initials: S
authors.lastname: Xiao
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhou
authors.forename: Jia
authors.initials: J
authors.lastname: Ge
authors.forename: Mable P
authors.initials: MP
authors.lastname: Fok
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055096:Optical Devices; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*