Transport network with high transmission capacity for telecommunications

• US 5,790,288 A
• Filed: 12/10/1996
• Issued: 08/04/1998
• Est. Priority Date: 04/15/1994
• Status: Expired due to Fees

• Current Assignee: Schofield Technologies LLC (Intellectual Ventures LLC)
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Kao, Ming Seng, Jager, Hubert Anton
• Primary Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US08/727,556
• Time in Patent Office: 602 Days
• Field of Search: 359/109, 359/123-125, 359/127-128, 359/137, 359/165, 359/115, 385/17, 370/406
• US Class Current: 398/75
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0241 Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
• CPC Class Codes: H04J 14/0284 WDM mesh architectures
• CPC Class Codes: H04J 14/0295 Shared protection at the optical channel (1:1, n:m)
• CPC Class Codes: H04J 14/08 Time-division multiplex systems
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 11/0071 Provisions for the electrical-optical layer interface
• CPC Class Codes: H04Q 2011/0043 Fault tolerance
• CPC Class Codes: H04Q 2011/0081 Fault tolerance; Redundancy; Recovery; Reconfigurability
• CPC Class Codes: H04Q 2011/0086 Network resource allocation, dimensioning or optimisation
• CPC Class Codes: H04Q 2011/009 Topology aspects

Abstract

A transport network with a transmission capacity for telecommunications in which nodes of the network are transparently connected with one another by optical glass fiber lines functionally to produce a full intermeshing of nodes permitting simultaneous addressing of all the nodes by every other node of the network. The nodes are coupled with one another in a matrix configuration in lines and columns. Each of corner nodes has at least n connections in the column direction and at least m connections in the line direction. Intermediate nodes (1,2 to 1,(m-1); n,2 to n,(m-1)) that are located in marginal lines, in a direction of the columns, have n connections and in a direction of the lines have 2·m connections. The intermediate nodes (2,1 to (n-1),1 and 2,m to (n-1),m)) located in marginal columns, in a line direction, have m connections and, in a column direction, have 2·n connections. Inner nodes of the network are connected with each of four neighbors by a total of 2·m connections, in the line direction, and 2·n connections, in the column direction. Individual nodes are addressable by at least one line and/or one column.

Claims

1. A transport network with a transmission capacity for telecommunications in which nodes of the network are transparently connected with one another by optical glass fiber lines functionally to produce a full intermeshing of nodes permitting simultaneous addressing of all the nodes by every other node of the network comprising:

(a) the nodes are coupled with one another in a matrix configuration in lines and columns;

(b) each of corner nodes has at least n connections in the column direction and at least m connections in the line direction;

(c) intermediate nodes (1,2 to 1,(m-1);

n,2 to n,(m-1)) that are located in marginal lines, in a direction of the columns, have n connections and in a direction of the lines have 2·

m connections, and the intermediate nodes (2,1 to (n-1),1 and 2,m to (n-1),m)) located in marginal columns, in a line direction, have m connections and, in a column direction, have 2·

n connections;

(d) inner nodes of network are connected with each of four neighbors by a total of 2·

m connections, in the line direction, and 2·

n connections, in the column direction;

(e) individual nodes are addressable by at least one line and/or one column;

(f) a transmitting node addresses the received node first by sending out information through a fiber associated with a column of a receiver and secondly by a signal identifier associated with a line of a receiving node;

(g) the receiver identifies the line in which a transmitter is located from the optical fiber through which signal light flux is conducted to it and identifies a column of the transmitting node from the signal identifier of the received light flux; and

(h) each node has (n·

m-1) transmitters that are operable with the corresponding signal identifiers and (n·

m-1) receivers each of which responds to one of the m different identifiers which are assigned to the nodes located in a line.

2. A network according to claim 1 wherein each node (n·

m-1) has optical transmitters and receivers that are operable on different wavelengths, with addressing being encoded into the different wavelengths.

3. A network according to claim 2 wherein time slots are associated with each node in a periodic sequence, within which each node is addressable by signals transmitted by the other nodes.

4. A network according to claim 3 wherein an unambiguous combination of a wavelength and a time slot is utilized for addressing.

5. A network according to claims 4 wherein the combination of wavelengths and time slots for addressing, the time slots are used only for addressing within a column and the data streams from different columns within a node are brought together only by power-dividing elements.

6. A network according to claim 2 wherein in the event of a failure of a node (1,1 to n,m) or an optical glass fiber link between two nodes, multiple protection paths can be connected.

7. A network according to claim 6, wherein the multiple protection paths can be switched by means of an electronic control unit so that data fluxes that were determined to pass a part of the network that has dropped out, from a respective sending node, with aid of a multiplex method, are added to a data stream that is conducted to a network node of another line in order there again be added to another data stream by a multiplex method, said stream leading to the original destination nodes of a bypassed protected data stream.

8. A network according to claim 2 wherein the nodes have a uniform integratable structure which has as many wavelength multiplexers and wavelength demultiplexers as the optical fibers and waveguides that are connected to it, and waveguides conduct only light fluxes with one wavelength, that link the optical outputs of the wavelength demultiplexers with the optical inputs of the wavelength multiplexers.

9. A network according to claim 8 wherein light fluxes on the waveguides that link the wavelength demultiplexers and the wavelength multiplexers are reinforced with optical semiconductor amplifiers and are regenerated in their modulation pulse formation.

10. A network according to claim 1 wherein at least two additional optical fibers can be connected from nodes other than those in the network to at least one node of the network.

11. A network according to claim 10 wherein the network is operable with M different wavelengths in which wavelength multiplexers and wavelength demultiplexers of the network are operable with at least M+1 different wavelengths.

12. A network according to claim 11 wherein for all nodes in both the column and line directions each time, at least N·

(N-1) connections are provided and the address of the line of each node is encoded into one of at least 2·

N-1 different wavelengths defined for the nodes of the line, where N is the larger of the two numbers n and m.

13. A telecommunications network with a transmission capacity at nodes (1,1 to n,m) of the network are linked together transparently with one another by optical glass fiber lines functionally to produce a complete intermeshing of nodes (1,1 to n,m) that permits a simultaneous addressing of all the nodes (1,1 to n,m) by every other node in network comprising:

(a) nodes (1,1 to n,m) are coupled with one another in a matrix arrangement in lines and columns;

(b) each corner node (1,1;

1,m;

n, 1, and n,m) has at least n connections in a column direction and has at least 2·

m connections in a line direction;

(c) intermediate nodes located in marginal lines (1,2 to 1,(m-1) and n,2 to n,(m-1)) have at least n connections in the column direction and have at least 2 m connections in line direction, and the intermediate nodes located in the marginal columns (2,1 to (n-1),1 and 2,m to (n-1),m)) have at least m connections in a line direction and have at least 2·

n connections in the column direction;

(d) inner nodes of the network are connected with each of four neighbors by a total of at least 2·

m connections in the line direction and by at least 2·

n connections in the column direction;

(e) individual nodes are addressable by at least one line and/or one column;

(f) a transmitting node addresses a receiving node first by emitting information through a fiber that is associated with a column of a receiver and second by a signal identifier that is associated with a line of the receiving node;

(g) the receiver identifies a line in which a transmitter is located on the optical fiber through which the signal light flux is conducted to the receiver and the column of the receiving node from the signal identifier of the received light flux;

(h) each node (n·

m-1) has transmitters that are operable with corresponding signal identifiers and (n·

m-1) receivers that respond to each of the m different identifiers that are associated with the nodes arranged in a line, characterized by the following features;

each of the corner nodes (1,1;

1,m;

n,1 and n,m) has at least 2·

(n-1) connections in the column direction and at least 2·

(m-1) connections in the line direction;

the intermediate nodes (1,2;

. . . ;

1,j;

. . . ;

1,(m-1) and n,2;

. . . ;

n,j;

. . . ;

n,(m-1) with j=(2;

3;

. . . ;

m-1)) located in marginal lines, have at least 2·

(n-1) connections in the column direction and at least 2·

(m-j)·

j+2·

(m-j+1)·

(j-1) connections in a line direction, and the intermediate nodes located in the marginal columns (2,1;

. . . ;

i,1;

. . . ;

(m-1),1 and 2,m;

. . . ;

1,j;

. . . ;

(n-1),m) with i=(2;

3;

. . . ;

n-1)) have at least 2·

(m-1) connections in the line direction and have at least 2·

(n-i)·

i+2·

(n-i+1)·

(i-1) connections in the column direction; and

the inner nodes (i,j with i=(2;

3;

. . . ;

n-1) and j=(2;

3;

. . . ;

m-1)) of the network are connected with each four neighbors by a total of at least 2·

(m-j)·

j+2·

(m-j+1)·

(j-1) connections, in the line direction, and with at least 2·

(n-i)·

i+2·

(n-i+1)·

(i-1) connections, in the column direction.

14. A network according to claim 13 wherein an address of a line of each node is encoded into one of N different wavelengths and each node is addressable at one of the different N wavelengths for the nodes of a line, with N being the larger of the two numbers n and m.

15. A network according to claim 14 wherein an identical structure is provided for all nodes to which fibers are attached that carry light fluxes, that lead to a column of the node, and to which those fibers are connected that carry those light fluxes that are directed from the node outward to other columns of the network, and the other fibers are looped through.

16. A network according to claim 15 wherein independently of whether addressing of a controlled node from another node in the network takes place by a primary selection of the column and secondary selection of the line or by a primary selection of the line and secondary selection of the column of a target node, the target node is always addressable by the same wavelength.

17. A network according to claim 16 wherein:

(a) the nodes of columns j and j+1 are connected together pairwise with four additional fibers in the line direction, with j=(1,3,5,7, . . . , m-3,m-1) for even-numbered m and j=(1,3,5,7, . . . , m-4,m-2,m-1) for odd-numbered m; and

(b) the nodes of line i and i+1 are connected together with four additional fibers pairwise in the column direction, where i=(1,3,5,7, . . . , n-3,n-1) for even-numbered m and i=(1,3,5,7, . . . , n4,n-2,n-1) for odd-numbered m.

18. A network according to claim 16, wherein time slots are assigned to the network in a period sequence within which the network is alternately switched to alternate signal path combinations.

19. A network according to claim 16, wherein at least two networks with an identified function and an identical transmission capacity but with different guidance of the signal paths are provided that are operable either alternately or jointly.