OTDM-to-WDM Conversion of Complex Modulation Formats by Time-Domain Optical Fourier Transformation

Abstract

Abstract:We demonstrate the utilization of the optical Fourier transform technique for serial-toparallel conversion of 64x10-GBd OTDM data tributaries with complex modulation formats into 50-GHz DWDM grid without loss of phase and amplitude information.

Time Lens-Based Optical Fourier Transformation for All-Optical Signal Processing of Spectrally-Efficient Data

“…Hence, the time lens is transparent to the data format. For example, a FWM-based OFT has been used to demonstrate OTDM-to-WDM conversion of a 320-GBd 16QAM signal [26]. Previously, time lenses have been demonstrated based on electro-optic phase modulation or nonlinear effects such as cross-phase modulation (XPM) or FWM [27].…”

Real-time coherent detection of phase modulated ultrashort pulses after time-to-space conversion and spatial demultiplexing

“…Serial-to-parallel demultiplexing has been successfully demonstrated by using time-to-frequency conversion, where the temporal pulse envelope is imprinted onto the spectrum of an FWM wave [11,12]. Individual tributaries of the OTDM signal can be demultiplexed and then either direct detected [13] or coherently detected with a local oscillator (LO) tuned to the specific wavelength channel [14]. However if phase continuity between tributaries is required then the LO's for coherent detection have to be phase locked across the broad converted spectrum [15], making phase detection more difficult.…”