Optical communications – Hybrid communication system
Reexamination Certificate
2005-03-08
2005-03-08
Pascal, Leslie (Department: 2633)
Optical communications
Hybrid communication system
C398S163000, C398S183000, C398S186000
Reexamination Certificate
active
06865345
ABSTRACT:
A frequency translating device (FTD) includes at least one light-activated resistor (LAR) connected to down-convert a radio frequency (RF) to an intermediate frequency (IF) and to up-convert an IF to an RF and a source of modulated light that is optically connected to the LAR. The source of modulated light is modulated in response to a local oscillator (LO) and the LAR is activated in response to the modulated light. Modulated light can be generated from a light source and an LO by, for example, directly modulating the light source, modulating a transmission switch that blocks the transmission of light to the LAR, or modulating a light path switch. The LAR-based FTD can be used as a reciprocal FTD to characterize another FTD in a three-pair measurement system. An FTD may include more than one LAR to form, for example, single-balanced and double-balanced LAR-based FTDs.
REFERENCES:
patent: 6373611 (2002-04-01), Farhan et al.
patent: 6501942 (2002-12-01), Weissman et al.
patent: 6556327 (2003-04-01), Ohya et al.
patent: 6643417 (2003-11-01), Strutz et al.
patent: 6731880 (2004-05-01), Westbrook et al.
Agilent Technologie,s Inc.
Pascal Leslie
Tran Dzung
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