Abstract
Single-polarization direct-detection transceivers may offer advantages compared to digital coherent technology for some metro, back-haul, access and inter-data center applications since they offer low-cost and complexity solutions. However, a direct-detection receiver introduces nonlinearity upon photo detection, since it is a square-law device, which results in signal distortion due to signal-signal beat interference (SSBI). Consequently, it is desirable to develop effective and low-cost SSBI compensation techniques to improve the performance of such transceivers. In this paper, we compare the performance of a number of recently proposed digital signal processing-based SSBI compensation schemes, including the use of single- and two-stage linearization filters, an iterative linearization filter and a SSBI estimation and cancellation technique. Their performance is assessed experimentally using a 7 × 25 Gb/s wavelength division multiplexed (WDM) single-sideband 16-QAM Nyquist-subcarrier modulation system operating at a net information spectral density of 2.3 (b/s)/Hz.
Highlights
The total data traffic in short- and medium-haul optical links/networks, spanning distances of up to several hundred kilometers, is rapidly increasing, with the largest drivers for the continuous growth being video-on-demand and data centers/cloud applications
The performance of both optical back-to-back and wavelength division multiplexing (WDM) transmission implementing the four signal-signal beat interference (SSBI) cancellation techniques was assessed using the experimental test-bed described above. 4.1 Optical back-to-back performance The optical back-to-back performance was evaluated by amplified spontaneous emission (ASE) noise loading at the receiver
It can be observed that the system performance was significantly improved when the SSBI cancellation methods were performed
Summary
The total data traffic in short- and medium-haul optical links/networks, spanning distances of up to several hundred kilometers, is rapidly increasing, with the largest drivers for the continuous growth being video-on-demand and data centers/cloud applications. Recent studies [1, 2] have reported that the metro traffic is growing almost twice as rapidly as the traffic traversing the core/backbone networks, with the majority of the bandwidth being terminated within the metro networks To cope with this growth, cost-effective optical transceivers offering low power consumption, resilience to noise and fiber impairments, and high information spectral density (ISD) play a key role. Subcarrier modulation (SCM) signal formats, in particular orthogonal frequency division multiplexing (OFDM) [5] and Nyquist-pulse shaped subcarrier modulation (Nyquist-SCM) [68], can be utilized to achieve high ISDs for DD systems Their performance is severely degraded because of a nonlinear effect introduced by the square-law detection, referred to as signal-signal beat interference (SSBI). It is essential to develop effective and low-cost SSBI compensation techniques for future high capacity and spectrally-efficient DD-based wavelength-division-multiplexing (WDM) shortand medium- haul transmission systems
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