Transmission of 10-Gb/s Directly Modulated RSOA Signals in Single-Fiber Loopback WDM PONs

Abstract

We demonstrate the transmission of 10-Gb/s upstream signals over 20-km fiber using a 1.3-GHz-bandwidth reflective semiconductor optical amplifier and a 40-ps delay interferometer (DI) in a loopback configured wavelength-division-multiplexed (WDM) passive optical network. We show that a single DI can be used in a set-and-forget mode to equalize 34 WDM channels anchored at the 100-GHz spaced ITU grid, without any help of postdetection electronic processing.Index Terms-Equalizers, modulation, passive optical network (PON), semiconductor optical amplifier (SOA), wavelength-division multiplexing (WDM).

A Dual-Detector Optical Receiver for WDM PON Utilizing Directly Modulated RSOAs and Delay Interferometers

“…3, the BER performance is degraded after transmission over fiber. This should be attributed to Rayleigh back-scattering-induced crosstalk [9]. Error floors after 20-km transmission are observed at around and for the single-detector and dual-detector receivers, respectively.…”

“…The DI acts as a two-tap optical equalizer as well as a vestigial side-band filter. With the proposed scheme, we have achieved an uncorrected bit-error ratio (BER) of , which is lower than forward error correction (FEC) threshold for , without any help of postdetection electrical signal processing [9]. Moreover, we have achieved negative dispersion penalties up to 30-km transmission over standard single-mode fiber (SSMF) [8].…”

“…R EFLECTIVE semiconductor optical amplifiers (RSOAs), thanks to their cost-effectiveness, color-free operation, and simultaneous amplification and modulation of seed light, have been under intensive research for upstream optical transmitters for wavelength-division multiplexing (WDM) passive optical networks (PONs) [1]- [9]. However, the modulation bandwidth of this semiconductor device is limited by the carrier lifetime and typically less than 3 GHz [1].…”

“…1) emulates a waveguide grating router (WGR) located at a remote node of a WDM-PON system. The RSOA used in our experiment is a multiquantum-well buried heterostructure device packaged in a transistor-outlook (TO)-can [9]. The modulation bandwidth is measured to be 1.3 GHz.…”

Off-set filtering for enhanced transmission in RSOA based WDM-PON

“…In particular due to usual band limitation of standard RSOA, to target high bit rates such as 10 Gb/s, various techniques have been demonstrated. Electronic equalization and Forward Error Correction (FEC) [5,6], off-set optical filtering aided by electronic equalization [7], detuned ad-hoc delay interferometers [8] and recently off-set filtering directly realized by a common WDM demultiplexer [9] proved the capacity to successfully target tens of kilometres feeder link with ONU directly modulated RSOAs. In this paper we present a new high performance RSOA, which shows improved E/O bandwidth, nevertheless due to chirp associated with direct modulation, the propagation at high bit rates is limited by the interaction with chromatic dispersion.…”