Resources Contact Us Home
Optical receiver using Mach-Zehnder interferometer

Image Number 18 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
Stable pharmaceutical composition and methods of using same
Methods of prognosing a rheumatoid arthritis remission phenotype
Milk frother
Automated top-down multi-abstraction infrastructure performance analytics -network infrastructure-as-a-service perspective
Method of inspecting wafer
Nonvolatile semiconductor memory device and method for manufacturing the same
  Randomly Featured Patents
Detection of surface cracks near a workpiece fastener hole by means of a rotatable probe
Monolithic microwave integrated circuit receiving device having a space between antenna element and substrate
Apparatus for applying a coating to a substrate
Method and device to detect the garbling of pulses received by a secondary radar by phase analysis
Control of floating gate oxide growth by use of an oxygen barrier
Energy distribution method for hydrid electric vehicle
Method and data processing system for monitoring operating states of a technical plant
Room air conditioner with timer controlled auxiliary power plug
Pharmaceutical composition
Balanced, multi-stud hold-down