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We discuss an optical ground terminal receiver architecture based on multi-aperture digital coherent combining. Experimental results using four receivers demonstrate lossless coherent combining in the laboratory at power levels below 0.1 photons/bit/receiver, and mitigation of scintillation through a 3.2-km free-space link due to spatial diversity.
This paper presents an implementation of a modulation technique which is effective in obscuring spectral phase encoded time-spreading (SPECTS) optical code division multiple access (O-CDMA) data streams from eavesdroppers tapping into single-user uplinks. This data modulation technique employs a finite-state Markov chain following a four-state trellis to encode user data in the electronic domain....
We demonstrate a proof-of-principle transmitter for flexible-bandwidth network with parallel synthesis and a wavelength-selective switch. Impairment-aware spectrum allocation is used to maintain data rates in spite of varying signal-to-noise ratio.
This paper presents a bandwidth-scalable, coherent optical transmitter based on the parallel synthesis of multiple spectral slices. As a proof-of-principle, two spectral slice, 6-ns DPSK and QPSK waveforms at 12 Gsymbols/s are generated and measured.
This paper experimentally demonstrates flexible-bandwidth networking by splitting a 500-GHz waveform generated by optical arbitrary waveform generation into its two tributary spectral slices using a liquid-crystal spatial light phase modulator as a wavelength selective switch.
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