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Coherent optical receivers have been widely used in free-space optical communication. We report on a coherent receiver with a homodyne optical phase-locked loop using a Costas loop. Differing from the conventional configuration, the demonstration in this paper with enhanced dynamic performance using an auxiliary acquisition and locking circuitry is able to achieve fast phase locking to signal laser...
We experimentally demonstrate the high-speed free-space optical (FSO) transmission over 1 km using 20 Gbit/s advanced coherent quadrature phase-shift keying (QPSK) signals. The constellation diagram and the bit error rate (BER) are measured. The receiving sensitivity of the FSO transmission is about −23.9 dBm at the BER of 3.3×10−3.
We experimentally demonstrate a vector-mode-division-multiplexing (VMDM) system based on opticalfrequency comb (OFC) over 80cm free space optical (FSO) link. The 228 Gbit/s data transmission has been achieved by using two basic vector modes over 20 wavelengths with direct detection orthogonal frequency division multiplexing (DD-OFDM) signal. The result shows that this VMDM system should be a good...
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