Electronic bandwidth and synchronization advantages are further gained by mapping the time slots of PPM onto a code space, or code/ pulse-position-swapping (C/PPS). Combining PPM with WDM over a fiber link (WDM/ PPM) enables multiple accessing and increases the link's throughput. Pulse position modulation ( PPM) signaling is favored in intensity modulated/direct detection (IM/DD) systems that have average power limitations. In this work, they present for the first time a generalized PPM translating receiver that is applicable to all M and data rates.Ĭomparison of WDM/ Pulse-Position-Modulation (WDM/ PPM) with Code/ Pulse-Position-Swapping (C/PPS) Based on Wavelength/Time Codes Designs for specific Ms (e.g., 4-ary) have been shown and implemented, but are difficult to scale to larger M. It has been considerably more difficult to define a similar receiver algorithm that translates the received optical pulse position directly back to a bit sequence with minimal electronic processing. Previous work described a transmitter algorithm that directly translates a bit sequence of N digital bits to the optical pulse position m for any M = 2. they have thus been exploring techniques for PPM communications using optical processing. In optical communication systems, PPM becomes challenging to implement at gigabit rates and/or large M, since pulsed signaling requires higher electronic processing bandwidths than the fundamental transmission rate. PPM is used in applications with average power limitations. M-ary pulse position modulation (M-ary PPM) signaling is a means of transmitting multiple bits per symbol in an intensity modulated/direct detection (IM/DD) system. Mendez, A J Hernandez, V J Gagliardi, R M Bennett, C V Design of Optical Pulse Position Modulation ( PPM) Translating ReceiverĮnergy Technology Data Exchange (ETDEWEB)
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