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We consider an uplink multicarrier system with multiple video users who want to send compressed video data to the base station. In the time domain, we model the time-varying channel using Jakes' model, and in the frequency domain, each subcarrier is assumed to be independently fading. The video is scalably coded in units of a group of pictures (GOP), and users have different video rate distortion...
A simple square or hexagonal 16-QAM generation technique using a commercially available dual drive IQ modulator driven by 4 binary signals is proposed. Square or hexagonal polarization multiplexed (PM) 16-QAM signals at 25Gbaud/s are experimentally demonstrated.
Using three co-polarized probes and a pump modulated signal, seven multicasting channels with 100-GHz spacing are demonstrated. The conversion efficiency fluctuation due to polarization sensitivity is reduced from more than 20 dB to 5 dB.
We propose and compare three schemes for realizing pumps suppression in a Broad- and flat-band tunable four wave mixing (FWM) wavelength converter (WC) without using a high-speed tunable filter. The signal and pumps are coupled into a high-nonlinear symmetrical Sagnac loop, after the FWM process, the idler and pump exit from different ports of the Sagnac loop. The idler to pump suppression ratio can...
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