Journal
IEEE PHOTONICS JOURNAL
Volume 13, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2020.3045049
Keywords
Interference; Adaptive equalizers; Wavelength division multiplexing; Passive optical networks; Optical reflection; Optical noise; Signal to noise ratio; Access network system; bidirectional transmission; interference suppression; passive optical network (PON); wavelength division multiplexing (WDM) scheme
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This paper proposes a novel return light cancellation technique using an adaptive interference equalizer in a WDM-PON system with single-wavelength bidirectional transmission, addressing the issue of reflected signal interference.
This paper proposes a novel return light cancellation technique using an adaptive interference equalizer in the wavelength division multiplexed passive optical network (WDM-PON) transmission system employing the single-wavelength bidirectional transmission scheme. In this scheme, the same wavelength is assigned to both the uplink and the downlink. In other words, the number of the wavelengths allocated to optical network units can be half compared with a typical PON system. However, this presents us with a problem in that the reflected component of the transmitted signal light interferes with the received signal light. We investigated the performance of the proposed interference canceling equalizer using back-to-back transmission simulation and a dual-polarizationquadrature-phase-shift-keying signal transmission experiment. The results indicated that the proposed adaptive equalizer enabled reception with no error when the OSNR was sufficiently large, even when the power of the interfering light was large (i.e., SIR >= 2 dB).
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