Resources Contact Us Home
Optical receiver using Mach-Zehnder interferometer

Image Number 10 for United States Patent #7995930.

The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.

  Recently Added Patents
Neurostimulation system
Boring machine
Microbial fuel cell and method of use
Method for providing information of access point selection
Philanthropy management apparatus, system, and methods of use and doing business
Secure data exchange for processing requests
Neuronal differentiation-inducing peptide and use thereof
  Randomly Featured Patents
Contact assembly
Soft gusset, hard-paneled luggage and method of manufacture
Method and apparatus for discriminating and counting documents
Methods and apparatus for cutting circular slots in pavement extending about manhole castings
Method and apparatus for representing image granularity by one or more parameters
Benzimidazole derivatives, agricultural and horticultural fungicides containing the same as an active ingredient and intermediate compounds thereof
Internal-combustion engine with two inlet valves for each cylinder and an electronically controlled system for actuating the inlet valves in differentiated and alternating ways
Planar chip-level power combiner
Percussion instrument support apparatus
Automatic projector calibration