Optical communications – Transmitter and receiver system – Including synchronization
Reexamination Certificate
2007-04-04
2011-12-13
Tran, Dzung (Department: 2613)
Optical communications
Transmitter and receiver system
Including synchronization
C398S150000, C398S155000
Reexamination Certificate
active
08078060
ABSTRACT:
Femtosecond pump/probe experiments using short X-Ray and optical pulses require precise synchronization between 100 meter-10 km separated lasers in a various experiments. For stabilization in the hundred femtosecond range a CW laser is amplitude modulated at 1-10 GHz, the signal retroreflected from the far end, and the relative phase used to correct the transit time with various implementations. For the sub-10 fsec range the laser frequency itself is upshifted 55 MHz with an acousto-optical modulator, retroreflected, upshifted again and phase compared at the sending end to a 110 MHz reference. Initial experiments indicate less than 1 fsec timing jitter. To lock lasers in the sub-10 fs range two single-frequency lasers separated by several teraHertz will be lock to a master modelocked fiber laser, transmit the two frequencies over fiber, and lock two comb lines of a slave laser to these frequencies, thus synchronizing the two modelocked laser envelopes.
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Holzwarth Ronald
Wilcox Russell B.
Fulbright & Jaworski L.L.P.
The Regents of The University of California
Tran Dzung
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