Optical cross-connector

• US 6,516,110 B2
• Filed: 09/18/2001
• Issued: 02/04/2003
• Est. Priority Date: 09/20/2000
• Status: Expired due to Fees

• Current Assignee: KDDI Corporation
• Original Assignee: KDDI Corporation
• Inventors: Ohara, Kazuho, Tanaka, Hideaki, Suzuki, Masatoshi, Hayashi, Michiaki
• Primary Examiner(s): PATEL, TULSIDAS C
• Application Number:
  US09/955,726
• Publication Number:
  US 20020034354A1
• Time in Patent Office: 504 Days
• Field of Search: 385/17, 385/18, 385/24, 385/42, 385/48, 385/88, 385/89, 359/115, 359/124, 359/127, 359/128, 359/139
• US Class Current: 385/17
• CPC Class Codes: G02B 6/3514 the reflective optical element moving along a line so as to translate into and out of the beam path, i.e. across the beam path
• CPC Class Codes: G02B 6/353 the optical element being a shutter, baffle, beam dump or opaque element absorbers on light guide termination G02B6/243
• CPC Class Codes: G02B 6/3546 NxM switch, i.e. a regular array of switches elements of matrix type constellation
• CPC Class Codes: G02B 6/356 in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links switching polarized beams G02B6/3594; power equalizers G02B6/356 and G02B6/3594; path selecting means H04Q11/0001
• CPC Class Codes: H04J 14/0204 Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
• CPC Class Codes: H04J 14/0205 Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
• CPC Class Codes: H04J 14/0206 Express channels arrangements
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0283 WDM ring architectures
• CPC Class Codes: H04J 14/0297 Optical equipment protection
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0015 using splitting combining
• CPC Class Codes: H04Q 2011/0024 using space switching
• CPC Class Codes: H04Q 2011/003 using switches based on microelectro-mechanical systems [MEMS]
• CPC Class Codes: H04Q 2011/0039 Electrical control
• CPC Class Codes: H04Q 2011/0043 Fault tolerance
• CPC Class Codes: H04Q 2011/0058 Crossbar; Matrix
• CPC Class Codes: H04Q 2011/0081 Fault tolerance; Redundancy; Recovery; Reconfigurability
• CPC Class Codes: H04Q 2011/0083 Testing; Monitoring

Abstract

To improve the reliability of matrix switches of redundant configuration, a splitter (14) splits each of a plurality of input lights into two portions and applies them to corresponding input ports of matrix switches (10a and 10b). The working matrix switch (10a) connects between desired input and output ports and an optical shutter (30a) connecting to an output port (#1) is in a light transmission state. The matrix switch (10b) connects all its input ports (#1 through #8) to an output port (#1). An optical shutter (30b) connecting to an output port (#1) is in a light blocking state. A combiner (26) combines the lights which are output from the output ports (#1) of the matrix switches (10a and 10b) and transmitted through the optical shutters (30a and 30b) and also combines the output lights from the corresponding output ports (#2 through #8) of the matrix switches (10a and 10b).

Claims

1. An optical cross-connector comprising:

a first and a second optical distributors, each distributor having a plurality of input ports and a plurality of output ports, a first connecting mode to connect between desired input and output ports, and a second connecting mode to block outputting of input lights of all the input ports;

a splitter to split each of a plurality of input optical signals into two portions and apply them to each input port of the first and second optical distributors;

a combiner to combine output lights from mutually corresponding output ports of the first and second optical distributors; and

a controller to switch between a first control state to cause the first optical distributor to operate in the first connecting mode and the second optical distributor in the second connecting mode, and a second control state to cause the first optical distributor to operate in the second connecting mode and the second optical distributor in the first connecting mode.

2. The optical cross-connector of claim 1 wherein the first optical distributor comprises a first optical switch having a plurality of input ports and a plurality of output ports to connect between desired input and output ports in the first connecting mode, and connect input lights of all the input ports and at least one predetermined output port in the second connecting mode, and at least one first optical shutter disposed between the at least one predetermined output port of the first optical switch and a corresponding input port of the combiner to transmit light in the first connecting mode and block light in the second connecting mode;

and

the second optical distributor comprises a second optical switch having a plurality of input ports and a plurality of output ports to connect between desired input and output ports in the first connecting mode and connect input lights of all the input ports, and at least one predetermined output port in the second connecting mode, and at least one second optical shutter disposed between the at least one predetermined output port of the second optical switch and a corresponding input port of the combiner to transmit light in the first connecting mode and block light in the second connecting mode.

3. The optical cross-connector of claim 2 wherein each of the first and second optical switches comprises a matrix switch.

4. The optical cross-connector of claim 2 further comprising a first input detector to detect input light of each input port of the first optical switch, a second input detector to detect input light of each input port of the second optical switch, a first output detector to detect output light from each output port of the first optical switch, a second output detector to detect output light from each output port of the second optical switch, and a supervisor to monitor the detection outputs from the first and second input detectors and the first and second output detectors.

5. The optical cross-connector of claim 4 wherein the supervisor monitors abnormal operation of the first and second switches through the operation mode of the first and second switches controlled by the controller, and the detection outputs from the first and second input detectors and the first and second output detectors.

6. The optical cross-connector of claim 2 further comprises an input detector to detect each of the plurality of input optical signals of the combiner, a first output detector to detect output light from each output port of the first optical switch, a second output detector to detect output light from each output port of the second optical switch, and a supervisor to monitor the detection outputs from the input detector and the first and second output detectors.

7. The optical cross-connector of claim 6 wherein the supervisor monitors abnormal operation of the first and second switches through the operation mode of the first and second switches controlled by the controller, and detection outputs from the input detector and the first and second output detectors.

8. The optical cross-connector of claim 1 further comprises a first detector to detect input light of each input port of the first optical distributor, a second input detector to detect input light from each input port of the second optical distributor, a first output detector to detect output light from each output port of the first optical distributor, a second output detector to detect output light from each output port of second optical distributor, and a supervisor to monitor detection outputs from the first and second input detectors and the first and second output detectors.

9. The optical cross-connector of claim 8 wherein the supervisor monitors abnormal operation of the first and distributors through the operation mode of the first and second distributors controlled by the controller, and detection outputs from the first and second input detectors and the first and second output detectors.

10. The optical cross-connectors of claim 1 further comprises an input detector to detect each of the plurality of input optical signals of the combiner, a first output detector to detect output light from each output port of the first optical distributor, a second output detector to detect output light from each output port of the second optical distributor, and a supervisor to monitor detection output of the input detector and the first and second output detectors.

11. The optical cross-connector of claim 9 wherein the supervisor monitors abnormal operation of the first and second distributors through the operation mode of the first and second distributors controlled by the controller, and detecting outputs from the input detector and first and second output detectors.

12. The optical cross-connector of claim 1 wherein the controller sets the first optical distributor in the second connecting mode after setting the second optical distributor in the first connecting mode when it switches the first and second optical distributors from the first control state to the second control state.

13. The optical cross-connector of claim 1 wherein the controller sets the second optical distributor in the first connecting mode and sets the first optical distributor in the second connecting mode at the same time when it switches the first and second optical distributors from the first control state to the second control state.