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This paper presents Bread Board Model (BBM) of homodyne BPSK (Binary Phase Shift Keying) receiver with an optical phase locked loop and a Doppler shifts compensator for inter-satellite optical communication link. 7.2Gbps BPSK data has been demodulated with sensitivity of −43dBm at bit error rate of 1e-6 under initial frequency offset of +/−7.5 GHz simulated as Doppler shifts due to relative motion...
This paper presents Bread Board Model (BBM) of homodyne BPSK (Binary Phase Shift Keying) receiver with an optical phase locked loop and a Doppler shifts compensator for inter satellite optical communication link. 2.5Gbps BPSK data has been demodulated with sensitivity of -49.1dBm at bit error rate of 1e-6 under initial frequency offset of +/-7.5 GHz simulated as Doppler shifts due to relative motion...
We demonstrate the two-photon resonant excitation of the doubly excited 2p21S state in helium atoms by the combination of 29.5- and 32.6-eV harmonic photons. Our ab-initio calculation confirms the nonlinear excitation by high harmonics.
Restoration of degraded Acacia koa forests in Hawaii often involves mechanical scarification to stimulate germination of seed buried in the soil and to suppress vegetation that competes with shade intolerant A. koa. Resulting even-age stands are gradually colonized by other plant species, but understory structure is poorly quantified, and the effects of management on understory vegetation are unknown...
The complete characterization of the 19th harmonic of Ti:sapphire laser was demonstrated using the photoelectron spectral shearing interferometry for the first time. The frequency chirp of a harmonic pulse was sensitively detected by this method.
Carrier-envelope phase-lacked 0.13-TW, 5.2-fs laser pulses were generated by using a 56-cm-long aluminum-coated hollow fiber with an efficiency of 66 %, improved by coating aluminum inside the fiber with a core diameter of 500-mum.
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