Abstract: A method and apparatus for routing light signals. A light signal is sent into a first optical fiber core in an optical coupler having an input region, a coupling region, and an output region. The first optical fiber core is located in a cladding having a substantially circular cross section. The light signal is coupled between the first optical fiber core and one of the first optical fiber core and a second optical fiber core in the coupling region of the optical coupler based on a position of the coupling region as the light signal travels through the coupling region to the output region of the optical coupler using a switching system configured to move the coupling region between one of a first position and a second position.

Abstract: A method and apparatus for routing light signals. A light signal is sent into a first optical fiber core in an optical coupler having an input region, a coupling region, and an output region. The first optical fiber core is located in a cladding having a substantially circular cross section. The light signal is coupled between the first optical fiber core and one of the first optical fiber core and a second optical fiber core in the coupling region of the optical coupler based on a position of the coupling region as the light signal travels through the coupling region to the output region of the optical coupler using a switching system configured to move the coupling region between one of a first position and a second position.

Abstract: A portable transceiver of one or more signals includes an input, frequency modulation, a splitter and a plurality of lasers in a transmitter module. A receiver module includes a Mangin mirror aligned with an input aperture. A photodiode receives the signal from the mirror for subsequent demodulation. An interference filter is arranged between the mirror and the photodiode. The filter is hemispherical, having a center of curvature at the focal point of the mirror. The transceiver may include a video camera and gyro-stabilizer accessories. A visual siting scope is aligned with the lasers and the receiver. A separate transceiver for ethernet input signals interfaces with a 10/100 ethernet switch and does not employ frequency modulation.

Abstract: A highly efficient thermoelectric cooler controller for temperature stabilization. The circuit comprises a temperature sensor and a thermoelectric cooler, both in thermal communication with a component to be temperature stabilized. The circuit further comprises a power amplifier electrically coupled to the thermoelectric cooler. The power amplifier is employed as a controlled current source to efficiently supply current to the thermoelectric cooler when maximum cooling is required.

Abstract: An optical wireless transceiver for communicating broadband signals through free space includes an input, a regenerator, a splitter and a plurality of lasers in transmitter modules. A very fast (low f-number) optical receiver module includes a reflector aligned with an input aperture. A photodiode receives the signal from the reflector for subsequent demodulation. A background rejection filter is disposed between the reflector and the photodiode at the focal point of the mirror. The transceiver provides signal regeneration and switchable data rates. Connections are made to optical or electrical digital inputs and outputs bearing signals of various protocols. The plurality of lasers includes adjustable-beamwidth collimating lenses. An efficient high-current, high power laser driver capable of modulating a laser between 100 and 1500 mA at data rates greater than 10 Mbits/sec is provided. A highly efficient thermoelectric cooler operates to cool the laser diode, or other components requiring cooling.

Abstract: An optical wireless transceiver for communicating broadband signals through free space includes an input, a regenerator, a splitter and a plurality of lasers in transmitter modules. A very fast (low f-number) optical receiver module includes a reflector, preferably a Mangin mirror or parabolic reflector with field corrector, aligned with an input aperture. A photodiode receives the signal from the reflector for subsequent demodulation. A background rejection filter is disposed between the reflector and the photodiode at the focal point of the mirror. The transceiver provides signal regeneration and switchable data rates. Connections are made to optical or electrical digital inputs and outputs bearing signals of various protocols. The plurality of lasers includes adjustable-beamwidth collimating lenses. Monitoring circuitry including a controller monitors the system. A stand-alone backup RF transceiver operating in conjunction with the laser transceiver provides enhanced availability.