Fading-free optical phase rate receiver
Patent 6043921 Issued on March 28, 2000. Estimated Expiration Date: 
August 12, 2017. 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.
August 12, 2017. 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 ReferencesOptical receiving method utilizing polarization diversity and apparatus for carrying out the same Patent #: 5140453 InventorApplicationNo. 910046 filed on 08/12/1997US Classes:398/205, Including polarization398/1, FAULT RECOVERY398/206Having feedbackExaminersPrimary: Negash, Kinfe-MichaelAttorney, Agent or FirmInternational ClassH04B 010/06AbstractA method and optical system for fading-free reception of optical phase sils having temporally varying polarization, phase and phase frequency is provided. Two orthogonally polarized local oscillators light waves of different frequencies are utilized to produce optical interference with an unknown polarization state optical input signal. Square law detection of the resultant optical interference yields a composite radio frequency signal which is decoded into four electronic outputs. These outputs are temporally differentiated and cross multiplied to produce a single composite output corresponding to the phase rate of the optical input signal. The total power of the four electronic outputs is proportional to the input signal power. The present invention thus maintains constant signal to noise ratios and avoids the use of internal clippers and limiters. | |
