Abstract
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-polarization-quadrature-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).
Highlights
The spread of passive optical network (PON) systems has been of benefit to many users thanks to broadband services
We proposed an adaptive interference equalizer (AIE) to compensate for the return light generated by an optical circulator that limits the link budget in the single-wavelength bidirectional wavelength division multiplexed passive optical network (WDM–PON) transmission scheme
We investigated the performance of the proposed equalizer in a DP–quadrature phase-shift keying (QPSK) signal transmission experiment in a self-homodyne configuration
Summary
The spread of passive optical network (PON) systems has been of benefit to many users thanks to broadband services. The conventional time-division multiplexing PON (TDM–PON) system causes delays the order of few milliseconds It is unsuitable for business users who require low latency. Each user is provided with a virtually independent communication channel This feature eliminates the need for a transmission waiting time in the optical network unit (ONU) to prevent signal collisions, which is necessary for TDM–PON and enables low-latency communication. The single-wavelength bidirectional WDM–PON system has a disadvantage that the reflected component of the transmitted signal light interferes with the received signal light. This paper proposes an adaptive interference equalizer (AIE) to compensate for the reflected light after the coherent detection to improve the link budget in the single-wavelength bidirectional WDM–PON system. We disclose effectiveness of the proposed scheme through simulative and experimental evaluation
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