Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-01-06
1999-05-25
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359194, 250214A, H04B 1006
Patent
active
059074221
ABSTRACT:
An optical receiver communication system converts optical signals modulated by analog or digital waveforms to RF signals. The optical receiver contains an automatic level control circuit to adjust the electronic gain of the system across a broad bandwidth spectrum. Two impedance matching circuits are designed using broad band matching technique to expand the bandwidth for increasing the maximum receivable frequencies to 1 GHz. A RLC impedance matching circuit forms a resonant combination to maintain .+-.1 dB fluctuation between the low-and-high-frequency limits of the bandwidth, and a 75.OMEGA. impedance matching circuit creates a 180.degree. phase shift between outgoing and incoming signals to ensure low return loss.
REFERENCES:
patent: 5347389 (1994-09-01), Skrobko
patent: 5477370 (1995-12-01), Little et al.
patent: 5745276 (1998-04-01), Ho et al.
Ho Ching
Jou Yue-Syan
Su Chun-Meng
Tu Yong Cheng
Wang Peter
Negash Kinfe-Michael
Qualop Systems Corp.
Sabath Robert P.
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