40 Gbit/s transmission over 406 km of NDSF using mid-span spectral inversion by four-wave-mixing in a 2 mm long semiconductor optical amplifier

Wavelength conversion for WDM communication systems using four-wave mixing in semiconductor optical amplifiers

“…This can simplify, for example, dispersion compensation in WDM systems by mid-span optical phase conjugation. However, simultaneous conversion does present the opportunity for crosstalk between the signals [17]- [19]. The magnitude of this crosstalk is determined approximately by the P/Q ratio and is experimentally investigated in this section.…”

“…Yariv et al [45] proposed optical phase conjugation to compensate for chromatic dispersion in single-mode fiber. Demonstrations have utilized both SOA [16] and fiber [46], [19] FWM wavelength converters to perform the optical phase conjugation with impressive results.…”

“…Offsetting this advantage are disadvantages associated with polarization dependent conversion as well as the required output filtering of spurious wavelengths. Nonetheless, FWM SOA wavelength converters have demonstrated high bit rate switching between WDM channels [14], [15], [24], dispersion compensation by phase conjugation (or mid-span spectral inversion) [16], [19], timedomain demultiplexing [40], multiplexing format conversion, [41], wavelength conversion of microwave subcarriers [42], and also limited signal processing [43], [44]. In particular, optical signal-to-noise ratio (OSNR), once considered the primary obstacle to any progress toward application of these devices has improved dramatically over the last year and further improvements seem likely.…”

Semiconductor optical amplifier-based all-optical gates for high-speed optical processing

“…Another potentially important application is dispersion compensation by midspan spectral inversion where the optical phase conjugation of the FWM process is useful [70]. It should be noted that very impressive results on midspan spectral inversion have also been reported using optical fiber as the nonlinear element [71].…”

Integrated Devices for Terabit per Second 1.3 and 1.5 Micron WDM/TDM Network Applications

“…Secondly, most components are commercially available making the system cost effective. Thirdly, the idler pulses, instead of being filtered out, could be utilized for mid-span wavelength conversion to extend the transmission distance [31,32], which is an advantage of the present scheme over the XPM-induced mode locking based clock recovery scheme [22].…”