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Building upon multi-rate optical transceivers developed for both near-Earth and deep-space communications, we present scalable next-generation designs for future systems requiring more compact implementation and both power- and photon-efficient performance.
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.
Combining optical-phase-locked loop based coherent detection, interleaving, and powerful rate-½ FEC enabled the error-free transmission of BPSK waveforms at information rates of 9.94-Gb/s and 19.88-Gb/s with sensitivities of 2.1 photons-per-bit and 3.9 photons-per-bit, respectively.
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.
Interfacing two I/Q modulators and a passband shaped spectral demultiplexer allows the coherent combination of two arbitrary modulated spectral lines to generate dynamic optical waveforms with 20 GHz bandwidth and 6 ns record lengths.
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.
We demonstrate ultrahigh-fidelity (G ≪ 0.4%) optical arbitrary waveform generation using an integrated arrayed-waveguide-grating pair based 128-channel Fourier pulse shaper with computer-controlled-feedback, a 17-mode 40-GHz optical-frequency comb source, and cross-correlation frequency-resolved optical-gating measurements.
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