40 Gbit/s field transmission over standard fibreusing midspan spectral inversion for dispersion compensation

Performance Comparison of DSF-, HNLF-, and Bi-NLF-based Optical Phase Conjugators

“…The optical phase conjugation is applied to a fiber system by placing the optical phase conjugator (OPC) at the midspan of the fiber link in order to compensate the signal distortion occurred in the former half by the propagation of phase-conjugated idler signal in the latter half [1]. According to a recent experimental report [2], a transmission of dense wavelength-division multiplexed (DWDM) 22 channels x 21.…”

40-Gb/s all-optical wavelength conversion based on a nonlinear optical loop mirror

“…Cross-gain modulation (XGM) [3], [4], cross-phase modulation (XPM) [5], [6], and four-wave mixing (FWM) [7]- [9] in semiconductor optical amplifiers (SOA's) have been demonstrated for 40 Gb/s wavelength conversion. But up to now, no 40 Gb/s wavelength conversion using a nonlinear optical loop mirror (NOLM) has been reported.…”

All-optical wavelength conversion of short pulses and NRZ signals based on a nonlinear optical loop mirror

“…To achieve all-optical wavelength conversion, various strategies have been investigated. There are mainly two kinds of media: one medium is based on semiconductor optical amplifiers (SOA's), and methods are cross-gain modulation (XGM) [3], [4], cross-phase modulation (XPM) [5], [6], and four-wave mixing (FWM) [7]- [9]; the other medium is based on fibers, and methods are FWM [10] and XPM [11]- [13] in dispersion shifted fibers (DSF's). FWM is transparent to both modulation format and signal bit-rate [7]- [10].…”

“…There are mainly two kinds of media: one medium is based on semiconductor optical amplifiers (SOA's), and methods are cross-gain modulation (XGM) [3], [4], cross-phase modulation (XPM) [5], [6], and four-wave mixing (FWM) [7]- [9]; the other medium is based on fibers, and methods are FWM [10] and XPM [11]- [13] in dispersion shifted fibers (DSF's). FWM is transparent to both modulation format and signal bit-rate [7]- [10]. The use of FWM in optical networks is possible only if high conversion efficiency and high signal-to-noise ratio (SNR) can be achieved, the latter being one of the main constraints of four-wave mixing (FWM) in semiconductor optical amplifiers (SOA's) due to the high amplified spontaneous emission (ASE) [7]- [9].…”

“…FWM is transparent to both modulation format and signal bit-rate [7]- [10]. The use of FWM in optical networks is possible only if high conversion efficiency and high signal-to-noise ratio (SNR) can be achieved, the latter being one of the main constraints of four-wave mixing (FWM) in semiconductor optical amplifiers (SOA's) due to the high amplified spontaneous emission (ASE) [7]- [9]. Because of the SNR degradation, regeneration cannot be realized by using FWM in SOA's.…”