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We examine the use of a depolarized broadband probe to experimentally measure the gain spectra of amplifiers comprising parametric and Raman gain. The suggested technique allows a quick and accurate characterization of gain spectra spanning more than 100 nm. We derive formulas for processing spectral data to address polarization dependent gain and idler generation, and consequently develop a measurement...
We report the amplification and characterization of 18×120Gb/s (2.16Tb/s) polarization-division multiplexed WDM signals using a polarization-insensitive single-pump FOPA, whilst achieving fiber-to-fiber net signal gains of 10–20dB over >2THz gain bandwidth.
We report a quick and accurate gain-spectrum measurement technique for broadband (>10THz) Raman and parametric optical amplifiers. Using a depolarized broadband source we predict WDM signal gain experimentally for both single and diverse polarization schemes.
We experimentally characterise discrete Raman amplification by varying pump power, fibre length and signal feedback level. We achieve up to 35dB gain for < 1dB bit error rate penalty using a fibre length of 8.65km.
We demonstrate polarisation insensitive dual-band optical phase conjugation for multiple 400Gbit/s optical superchannels using a Raman amplified transmission link with a realistic span length of 75km. The resultant increase in transmission distance is confirmed analytically.
We propose a novel architecture for all-optical add-drop multiplexing of OFDM signals. Extensive numerical simulations have been carried out to benchmark the performance of the architecture against critical design parameters.
We demonstrate the first multi-wavelength regeneration of quadrature phase shift keyed (QPSK) formatted signals, showing a simultaneous Q2-factor improvement in excess of 3.8 dB for signals degraded by phase distortion
Experimental investigations of 10×118 Gbit/s DP-QPSK WDM transmission using three types of distributed Raman amplification techniques are presented. Novel ultra-long Raman fibre laser based amplification with second order counter-propagated pumping is compared with conventional first order and dual order counter-pumped Raman amplification. We demonstrate that URFL based amplification can extend the...
We demonstrate a novel phase noise estimation scheme for CO-OFDM, in which pilot subcarriers are deliberately correlated to the data subcarriers. This technique reduces the overhead by a factor of 2.
We demonstrate 40 × 43Gbit/s RZ-DQPSK transmission over 1000km of ultra-low-loss G.652 fibre with 250km amplifier spacing. Hybrid Raman-EDFA amplification with co- and contra-directional Raman pumping enables 27dB Raman gain per span and error-free post-FEC performance.
We report an experimental comparison between broadband fibre Bragg gratings (FBGs) and conventional dispersion compensating fibre (DCF) for a 40 x 10Gb/s DWDM system over 525km. A performance-optimised configuration using FBG compensators is presented.
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