A scalable multicast M×N optical switch (MCS) includes a non-scalable MCS having a plurality of (L+1)×1 selector switches east coupled at one of its L entrance ports to egress ports of the non-scalable MCS, the remaining L−1 entrance ports being coupled to an L*N upgrade ports, where M and N are int
A scalable multicast M×N optical switch (MCS) includes a non-scalable MCS having a plurality of (L+1)×1 selector switches east coupled at one of its L entrance ports to egress ports of the non-scalable MCS, the remaining L−1 entrance ports being coupled to an L*N upgrade ports, where M and N are integers ≧2, and L is an integer ≧1. This allows the scalable MCS to be cascaded in a daisy-chain fashion, providing scalability from the M common ports to L*M common ports. In another embodiment, the selector switches are integrated into the MCS, providing scalability of common MCS ports.
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1. An expandable M×N multicast optical switch comprising: M common ports, N add/drop ports, and L*N upgrade ports, wherein M and N are integers ≧2, and L is an integer ≧1;a non-expandable M×N blocking multicast optical switch comprising M ingress ports each coupled to a unique one of the M common po
1. An expandable M×N multicast optical switch comprising: M common ports, N add/drop ports, and L*N upgrade ports, wherein M and N are integers ≧2, and L is an integer ≧1;a non-expandable M×N blocking multicast optical switch comprising M ingress ports each coupled to a unique one of the M common ports, and N egress ports; andN (L+1)×1 optical splitters/combiners each comprising L+1 entrance ports and one exit port, wherein each one of the N (L+1)×1 optical splitters/combiners has one of the entrance ports coupled to a unique one of the N egress ports, and the exit port coupled to a unique one of the N add/drop ports;wherein each one of the remaining L entrance ports of the N (L+1)×1 optical splitters/combiners is coupled to a unique one of the L*N upgrade ports. 2. A 2M×N optical switch comprising: the expandable M×N multicast optical switch of claim 1, wherein L=1; andan additional multicast M×N optical switch comprising M common ports and N add/drop ports, wherein each of the N add/drop ports of the additional multicast M×N optical switch is coupled to a unique one of the N upgrade ports. 3. A 3M×N optical switch comprising: the expandable M×N multicast optical switch of claim 1, wherein L=2; andfirst and second additional multicast M×N optical switches each comprising M common ports and N add/drop ports, wherein each of the N add/drop ports of the first and second additional multicast M×N optical switches is coupled to a unique one of the L*N upgrade ports. 4. An optical switch comprising two expandable M×N multicast optical switches of claim 1, wherein N of the L*N upgrade ports of one of the two expandable M×N multicast optical switches are coupled one-to-one to N of the L*N upgrade ports of the other of the two expandable M×N multicast optical switches, thus providing a loopback capability between the N add/drop ports of the two expandable M×N multicast optical switches. 5. An optical module comprising the expandable M×N multicast optical switch of claim 1 and N coherent receivers each coupled to a unique one of the N add/drop ports. 6. An expandable M×N multicast optical switch comprising: M common ports, N add/drop ports, and 2N upgrade ports, wherein M and N are integers ≧2;N (M+L)×1 selector optical switches each comprising M+L entrance ports, and an exit port coupled to a unique one of the N add/drop ports;an optical splitter coupled to the M common ports, for coupling each of the M common ports to a unique entrance port of each one of the N (M+L)×1 selector optical switches;wherein each of the remaining L entrance ports of each of the N (M+L)×1 selector optical switches is coupled to a unique one of the L*N upgrade ports; andfirst and second additional multicast M×N optical switches each comprising M common ports and N add/drop ports, wherein each of the N add/drop ports of the first and second additional multicast M×N optical switches is coupled to a unique one of the L*N upgrade ports. 7. The expandable M×N multicast optical switch of claim 6, wherein each selector optical switch is selected from the group consisting of a LCOS optical switch, a MEMS optical switch, and a PLC optical switch. 8. The expandable M×N multicast optical switch of claim 6, wherein the optical splitter comprises a diffractive optical element. 9. An optical module comprising the expandable M×N multicast optical switch of claim 6 and N coherent receivers each coupled to a unique one of the N add/drop ports. 10. A reconfigurable optical add/drop multiplexor comprising: first and second expandable M×N multicast optical switches, each comprising: M common ports, N add/drop ports, and L*N upgrade ports, wherein M and N are integers ≧2, and L is an integer ≧1;a non-expandable M×N multicast optical switch comprising M ingress ports each coupled to a unique one of the M common ports, and N egress ports; andN (L+1)×1 optical couplers each comprising L+1 entrance ports and one exit port, wherein each one of the optical couplers has one of the entrance ports coupled to a unique one of the N egress ports, and the exit port coupled to a unique one of the N add/drop ports;wherein each one of the remaining L entrance ports of the N (L+1)×1 optical couplers is coupled to a unique one of the L*N upgrade ports; andfirst and second 1×(M+1) input wavelength-selective optical switches, and first and second (M+1)×1 output wavelength-selective optical switches;wherein one of the M+1 output ports of the first input wavelength-selective optical switch is coupled to one of the M+1 input ports of the first output wavelength-selective optical switch, and one of the M+1 output ports of the second input wavelength-selective optical switch is coupled to one of the M+1 input ports of the second output wavelength-selective optical switch;wherein a first one of the remaining M output ports of the first and second input wavelength-selective optical switches is coupled to first and second of the M common ports of the first expandable M×N multicast optical switch, respectively; andwherein a first one of the remaining M output ports of the first and second output wavelength-selective optical switches is coupled to first and second of the M common ports of the second expandable M×N multicast optical switch, respectively. 11. The reconfigurable optical add/drop multiplexor of claim 10, further comprising N coherent optical receivers each coupled to a unique one of the N add/drop ports of the first expandable M×N multicast optical switch. 12. The reconfigurable optical add/drop multiplexor of claim 10, further comprising: third and fourth expandable M×N multicast optical switches, wherein each add/drop port of the third and fourth expandable M×N multicast optical switches is coupled to a unique one of the upgrade ports of the first and second expandable M×N multicast optical switches, respectively;third and fourth 1×(M+1) input wavelength-selective optical switches, and third and fourth (M+1)×1 output wavelength-selective optical switches;wherein one of the M+1 output ports of the third input wavelength-selective optical switch is coupled to one of the M+1 input ports of the third output wavelength-selective optical switch, and one of the M+1 output ports of the fourth input wavelength-selective optical switch is coupled to one of the M+1 input ports of the fourth output wavelength-selective optical switch;wherein a first one of the remaining M output ports of the third and fourth input wavelength-selective optical switches is coupled to first and second of the M common ports, respectively, of the third expandable M×N multicast optical switch; andwherein a first one of the remaining M output ports of the third and fourth output wavelength-selective optical switches is coupled to first and second of the M common ports, respectively, of the fourth expandable M×N multicast optical switch. 13. A reconfigurable optical add/drop multiplexor comprising: first and second expandable M×N multicast optical switches, each comprising: M common ports, N add/drop ports, and L*N upgrade ports, wherein M and N are integers ≧2, and L is an integer ≧1;N (M+L)×1 selector optical switches each comprising M+L entrance ports, and an exit port coupled to a unique one of the N add/drop ports; andan optical splitter coupled to the M common ports, for coupling each of the M common ports to a unique entrance port of each one of the N (M+L)×1 selector optical switches;wherein each of the remaining L entrance ports of each of the N (M+L)×1 selector optical switches is coupled to a unique one of the L*N upgrade ports; andfirst and second 1×(M+1) input wavelength-selective optical switches, and first and second (M+1)×1 output wavelength-selective optical switches;wherein one of the M+1 output ports of the first input wavelength-selective optical switch is coupled to one of the M+1 input ports of the first output wavelength-selective optical switch, and one of the M+1 output ports of the second input wavelength-selective optical switch is coupled to one of the M+1 input ports of the second output wavelength-selective optical switch;wherein a first one of the remaining M output ports of the first and second input wavelength-selective optical switches is coupled to first and second of the M common ports of the first expandable M×N multicast optical switch, respectively; andwherein a first one of the remaining M output ports of the first and second output wavelength-selective optical switches is coupled to first and second of the M common ports of the second expandable M×N multicast optical switch, respectively. 14. The reconfigurable optical add/drop multiplexor of claim 13, further comprising N coherent optical receivers each coupled to a unique one of the N add/drop ports of the first expandable M×N multicast optical switch. 15. The reconfigurable optical add/drop multiplexor of claim 13, further comprising: third and fourth expandable M×N multicast optical switches, and wherein each add/drop port of the third and fourth expandable M×N multicast optical switches is coupled to a unique one of the upgrade ports of the first and second expandable M×N multicast optical switches, respectively;third and fourth 1×(M+1) input wavelength-selective optical switches, and third and fourth (M+1)×1 output wavelength-selective optical switches;wherein one of the M+1 output ports of the third input wavelength-selective optical switch is coupled to one of the M+1 input ports of the third output wavelength-selective optical switch, and one of the M+1 output ports of the fourth input wavelength-selective optical switch is coupled to one of the M+1 input ports of the fourth output wavelength-selective optical switch;wherein a first one of the remaining M output ports of the third and fourth input wavelength-selective optical switches is coupled to first and second of the M common ports, respectively, of the third expandable M×N multicast optical switch; andwherein a first one of the remaining M output ports of the third and fourth output wavelength-selective optical switches is coupled to first and second of the M common ports, respectively, of the fourth expandable M×N multicast optical switch.
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이 특허에 인용된 특허 (3)
Chang, Gee-Kung; Chowdhury, Arshad M.; Ellinas, Georgios, Optical layer multicasting using a single sub-carrier header and a multicast switch with active header insertion via light circulation.
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