Multiplex communications – Wide area network – Packet switching
Patent
1988-08-15
1991-04-23
Eisenzopf, Reinhard J.
Multiplex communications
Wide area network
Packet switching
455600, H04J 1400
Patent
active
050105426
ABSTRACT:
A multi-stage switching network in which a plurality of optical binary couplers are symmetrically connected to each other relative to the center line of the switching network and pyramids of the optical binary couplers individually associated to switching network terminals are provided, and every optical binary coupler in said pyramids is unconnected at one of its two light-conducting paths on that side which faces away from the center line of the switching network, and across the center line of the switching network, every binary coupler pyramid is connected in a light-conducting manner to every binary coupler pyramid lying at the other side such that every switching network through-connect path outgoing from a switching network terminal or, respectively, leading to a switching network terminal contains an unconnected light-conducting path of an optical binary coupler when all binary couplers are in the crossed through-connect condition. Controllable electro-optical directional couplers can be used as the optical binary couplers. The unconnected light-conducting path can be terminated with a light absorber.
REFERENCES:
patent: 3980831 (1976-09-01), Mertel
patent: 4011543 (1977-03-01), Soref
patent: 4351985 (1982-09-01), Schlichte et al.
patent: 4731878 (1988-03-01), Vaidya
patent: 4787692 (1988-11-01), Spanke
patent: 4807280 (1989-02-01), Posner
Opto-Electronic Exchange of the Future by Blackmore, Stewart and Gennion, ISS 84 Florence, 7-11, May 1984.
Electronics Week Entitled "Switches Take to Optics", Mar. 18, 1985.
PCT Application WO 87/04886.
Eisenzopf Reinhard J.
Siemens Aktiengesellschaft
Van Bek L.
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