Polarisation-insensitive 640 Gbit/s demultiplexing using a polarisation-maintaining highly non-linear fibre

Abstract

Polarisation-insensitive 640 Gbit/s demultiplexing is demonstrated using a 100 m polarisation-maintaining highly non-linear fibre. Error-free performance is achieved with only 0.2 dB polarisation dependence.

650 Gbit/s OTDM Transmission over 80 km SSMF Incorporating Clock Recovery, Channel Identification and Demultiplexing in a Polarisation Insensitive Receiver

“…This makes the full receiver stable and insensitive to polarisation, which is verified by operating the system with a polarisation scrambler at the receiver input, yielding only 0.4 dB penalty. The demultiplexer comprises 100 m of polarisation maintaining HNLF (PM-HNLF, γ ~10 (W km) -1 , λ 0 =1545 nm) and is described in detail and characterised in [3]. Control pulses for the demultiplexer are generated by a second ERGO pulse source and non-linear pulse compression in an HNLF identical to the ones used in the transmitter.…”

1.28 Tb/s Wavelength Conversion for Polarisation Multiplexed RZ-DPSK Signals

“…1 (a). It provides a polarisation diversity scheme with an intrinsic equalization of the differential group delay in the two arms [3], which consists of a PM-HNLF, a polarisation beam splitter (PBS), a circulator and a coupler. A data signal and a continuous wave (CW) pump are coupled together and launched into the PBS through a 3-dB optical coupler (OC) and a circulator.…”

“…With the introduction of the 1 Tbit/s Ethernet, all the network techniques such as switching and routing on such high bit rates become quite challenging, and the electronic signal processing technique cannot carry the burden in the near future. On the other hand, all-optical signal processing techniques have shown the potential for high-speed signal processing on 640 Gb/s or beyond [2][3].…”

Polarization-Insensitive 640 Gb/s Demultiplexing Based on Four Wave Mixing in a Polarization-Maintaining Fibre Loop

“…Error free performance with low penalty is achieved with less than 0.2 dB polarization dependence of the FWM efficiency. This paper elaborates on the results in [12] and provides more detailed characterizations and explanations. Section II explains the operation principle of the polarization insensitive optical switch.…”

“…Among the techniques for OTDM demultiplexing, those based on cross phase modulation (XPM) and four wave mixing (FWM) are attractive due to their fast response and possiblility to preserve phase information. Several schemes have been demonstrated for OTDM demultiplexing at 640 Gb/s or above, such as a non-linear optical loop mirror (NOLM) [6]- [8], [10], FWM in a fibre or a chalcogenide waveguide [12], [13], XPM and subsequent filtering in a semiconductor optical amplifier (SOA). [14], and a digital coherent receiver with an OTDM demultiplexing function [15], [9].…”