Plural frequency oscillator employing multiple fiber-optic delay line
Patent 4297656 Issued on October 27, 1981. Estimated Expiration Date: 
March 23, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 23, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFrequency synthesizer having frequency control loop including fiber optic delay line EMP Resistant oscillator with fiber optic frequency determining means Voltage controlled oscillator (VCO) employing nested oscillating loops Patent #: 4105950 InventorAssigneeApplicationNo. 06/023394 filed on 03/23/1979US Classes:331/135, PHASE SHIFT TYPE250/227.12, Optical delay line331/60, SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS968/817APPARATUS FOR PRODUCING PRESELECTED TIME INTERVALS FOR USE AS TIMING STANDARDS (GENERATING CLOCK SIGNALS FOR ELECTRIC DIGITAL COMPUTERS G06F 1/04; REGULATING FREQUENCY IN GENERAL H03C, L) [G04F 5/00]ExaminersPrimary: Grimm, Siegfried H.Assistant: Westin, Edward P. Attorney, Agent or FirmInternational ClassesG04F 5/00 (20060101)H04B 10/12 (20060101) H03B 17/00 (20060101) AbstractStabilization of an oscillator, particularly an RF oscillator, is achieved by an arrangement employing a fiber optic delay line. The delay line has a Q defined by the relationship Q=2πf͌, where f is the oscillator operation frequency and ͌ is the length of the delay line. Opto/electronic and electro optic transducers are coupled between the electrical oscillator circuitry and the optical delay line for interfacing the electrical section of the RF oscillator with its optical section. This optic delay line may be configured as a single optical fiber where a single output frequency is desired, or it may be configured of a plurality of optical fibers of respectively different lengths, where plural output frequencies are to be produced.Other References
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