Fibertek is developing a power efficient, space qualifiable Eight WDM Channel PPM Downlink Seed Laser Module (SAM) with TDM based FWM Mitigation Capability. SAM will be compatible with the space qualifiable, high TRL, 8 WDM channel, 50W WDM Amplifier prototype that was delivered in early 2021. Together the two modules make up a complete High TRL spaceflight high power DSOC WDM Transmitter. Measurements of FWM-PEV statistics using realistic PPM patterns are presented. Measurements show that FWM mitigation is not needed for PPM orders 16 and 32. TDM based FWM mitigation algorithm using two wavelength subslots is implemented on the realistic PPM patterns for five out of the six PPM64 and PPM128 formats successfully. Mitigation in all cases results in significant improvement in PEV statistics. Achieved statistics for all PPM formats are considered manageable using FEC.
Fibertek is developing a power efficient, space qualifiable Eight WDM Channel PPM Downlink Tx Seed LAser Module (SAM) with TDM based FWM Mitigation Capability. SAM will be compatible with space qualifiable, high TRL, 8 WDM channel, 50W WDM Amplifier prototype that was delivered in early 2021. SAM together with the WDM Amplifier will meet all the requirements of a spaceflight DSOC WDM Transmitter. Fibertek has developed a comprehensive multi gain stage 1.5um WDM fiber amplifier numerical model that accurately quantifies the degradation of WDM PPM signals due to FWM. The physics model is used to quantify FWM-PEV for all 2 and 3 overlapping wavelength configurations of PPM orders 256-16. Results are used as inputs to a PPM statistics model that calculates the PEV statistics for all the PPM orders and WDM channels. The significant Improvements of the PEV statistics with the TDM based FWM mitigation using 2 or 3 wavelength subslots are quantified.
Fibertek is developing a power efficient, space qualifiable Eight WDM Channel PPM Downlink Tx Seed LAser Module (SAM) with Time Division Multiplexing (TDM) based FWM Mitigation Capability. SAM will be compatible with space qualifiable, high TRL, 8 WDM channel, 50W WDM Amplifier prototype that was delivered in early 2021. SAM together with the WDM Amplifier will meet all the requirements of a spaceflight Deep Space Optical Communication (DSOC) WDM Transmitter (Tx) that can support link distances of 2AU and date rates of 2Gbit/sec. TDM based FWM mitigation is experimentally demonstrated using the high TRL WDM Amplifier at 40W operation with PPM(128+32) format. Fibertek has developed a comprehensive multi gain stage 1.5um WDM fiber amplifier numerical model that accurately quantifies the degradation of WDM PPM signals due to FWM. Comparisons of the simulation to the High power WDM PPM experiments are presented. Using the model system level requirements for the WDM PPM SAM are studied.
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