Abstract
Due to their simple and cost-effective transceiver architecture, single-polarization and single-photodiode-based direct-detection (DD) systems offer advantages for metropolitan area network and data-center interconnect applications. Single-sideband subcarrier modulation (SSB SCM) signaling with DD has the potential to achieve high information spectral density (ISD) but its performance can be significantly degraded by signal–signal beat interference (SSBI). The recently proposed Kramers–Kronig (KK) digital signal processing scheme is effective in eliminating the SSBI penalty. Through the use of the KK scheme, we achieved 4 × 168 Gb/s wavelength division multiplexing DD SSB 64-QAM Nyquist-SCM signal transmission over 80 km of uncompensated standard single-mode fiber at a net ISD of up to 4.61 (b/s)/Hz. The joint optimization of the optical carrier-to-signal power ratio and the KK algorithm sampling rate is described.
Highlights
IT is widely recognized that the unprecedented traffic growth in metropolitan area networks, mobile back-haul and inter-data center links will require optical fiber transmission systems which offer high capacity, spectrally-efficient signaling with tolerance to transmission impairments, usingManuscript received XXX
Since the optical carrier-to-signal power ratio (CSPR) is a crucial parameter for the performance of SSB DD system, it needs to be optimized for each value of the optical signal-to-noise ratio (OSNR)
The transmission experiments were performed using an 80 km single-span standard single-mode fiber (SSMF) followed by an Erbium-doped fiber amplifier (EDFA) with a noise figure of 5 dB
Summary
IT is widely recognized that the unprecedented traffic growth in metropolitan area networks, mobile back-haul and inter-data center links will require optical fiber transmission systems which offer high capacity, spectrally-efficient signaling with tolerance to transmission impairments, usingManuscript received XXX. IT is widely recognized that the unprecedented traffic growth in metropolitan area networks, mobile back-haul and inter-data center links will require optical fiber transmission systems which offer high capacity, spectrally-efficient signaling with tolerance to transmission impairments, using. In contrast to double sideband (DSB) signaling, SSB signaling avoids dispersion induced power fading [7] and, at the same time, increases the achievable optical information spectral density (ISD) [8, 9]. In order to make such systems capable of transmitting high data rate (≥ 100 Gb/s/λ) and spectrally-efficient (≥ 3 (b/s)/Hz) payloads over typical medium reach links of up to ~80 km (e.g. metro networks and data-center interconnects), it is necessary to implement techniques that can reduce or eliminate this impairment
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