The optical crossbar switch for signal routeing on board communication satellites
Abstract
A switch matrix operating on baseband or microwave signals is a critical element of communications satellites employing multiple beam antennas and on-board switching. Optical switching by spatial light modulators (SLMs) offers a means of implementing large and highly flexible switch arrays capable of routeing signals at baseband or microwave frequencies. This approach offers potential mass, power and size advantages compared to alternative technologies. This paper reviews the essential features of optical crossbar switch architectures based on SLMs and discusses options for the lasers, ALMs, interface optics and photodetectors. Proof-of-concept demonstrators for optical crossbar switches operating on both baseband and microwave signals are described. Finally, an outline design for a compact switch module is described and the critical component developments needed to realize this are identified.
- Publication:
-
International Journal of Satellite Communications
- Pub Date:
- April 1994
- Bibcode:
- 1994IJSC...12R.135B
- Keywords:
-
- Communication Satellites;
- Light Modulation;
- Optical Coupling;
- Optical Switching;
- Photometers;
- Semiconductor Lasers;
- Spacecraft Electronic Equipment;
- Frequency Division Multiple Access;
- Laser Arrays;
- Spread Spectrum Transmission;
- Switching Circuits;
- Time Division Multiple Access;
- Spacecraft Design, Testing and Performance