G - Physics
02
F
345/60
G02F 1/31 (2006.01) G02F 1/13 (2006.01) H04Q 3/52 (2006.01)
Patent
CA 1311549
ABSTRACT (ref Figure 1) AN OPTICAL SWITCH An optical switch comprising a series of 2(n-1) macro-cells (7, 8), each having a variable polarisation rotating cell (7) with up to n individually addressable sub-cells (S) each located at one of n positions Pl to Pn and birefringent cell; (n-1) birefringent cells (8) being orientated relative to light passing through so that light passing through a subcell (S) (at position Pi) is switchable to pass through positions Pi or Pi+1 of the variable polarisation rotating cell (7) of the next macro-cell in the series, and (n-1) birefringent cells (8) being orientated relative to light passing through so that light passing through a sub-cell (S) (at position Pi) is switchable to pass through position Pi or Pi-1 of the variable polarisation rotating cell (7) of the next marco-cell in the series, the subcells-(8) being positioned to provide that light from any one of n inputs is switchable independently to any of n outputs, where n > 1.
568585
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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