Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-01-06
1998-01-06
Gregory, Bernarr E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359180, 359189, H04B 1002, H04B 1004, H04B 1006
Patent
active
H00017027
ABSTRACT:
In the transmission electrical signals using an optical carrier the signal power carried by an optical carrier is proportional to the optical power. High optical power levels are desired for optical carriers that are modulated by weak electrical signals, however, significant unmodulated power is left in the original carrier after processing. To maximize the radio frequency (RF) signal power generated by a given (maximized) photodetector current (for a given input power), in this invention, the optical carrier power is reduced. This is accomplished by the addition of a narrowband optical filter, such as a Fabry-Perot filter, to reduce the average optical carrier power without reducing the modulation sidebands, which results in an increased modulation depth. Therefore, greater RF and microwave power is generated by a photodetector with the same photocurrent. With a laser source exhibiting a beam whose linewidth is narrow compared to the filter bandwidth, the filter is tuned, or frequency locked, to match the filtering resonance with the optical carrier wavelength. With the high finesse filter and narrow-linewidth laser beam, the frequency range of operation is extended from the filter half-bandwidth to the next resonance of the filter. Thus, broadband effective gain results without introducing additional noise.
REFERENCES:
patent: 4498179 (1985-02-01), Waynes et al.
patent: 4588255 (1986-05-01), Tur et al.
patent: 5227908 (1993-07-01), Henmi
patent: 5287212 (1994-02-01), Cox et al.
patent: 5361155 (1994-11-01), Chiaroni et al.
patent: 5373383 (1994-12-01), LaGasse
Miller, "Characteristics and Applications of High Performance, Tunable, Fiber Fabry-Perot Fillers", Electronic Components, 1991, pp. 489-492.
Williams et al, "Observation of Photodetector Nonlinearities,"Elec. Ltrs., vol. 28, No. 8, pp. 731-732, 1992.
Day et al., "30 Hz-Width, Diode-Laser-Pumped Nd:GGG Nonplanar Ring Oscillotors by Active Frequency Stabilization," Elec. Ltrs., vol. 25, No. 13, pp. 810-812, 1989.
Yue et al., "Fibre Ring Resonator with Finesse of 1260," Elec. Ltr, vol. 24, No. 10, pp. 110-111, 1988.
Bowers et al., "Filter Response of Single-Mode Fibre Recirculating Delay Lines," Elec. Ltrs, vol. 18, No. 3, pp. 110-111, 1982.
Stokes et al., "All-Single-Mode Fibre Resonator," Opt. Ltrs, vol. 7, No. 6, pp. 288-290, 1982.
Alexander Edward
Esman Ronald D.
Goldberg Lew
Williams Keith J.
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