Transmission system

• US 20060050803A1
• Filed: 04/14/2003
• Published: 03/09/2006
• Est. Priority Date: 04/12/2002
• Status: Active Grant

• Current Assignee: Neptune Subsea IP Ltd. (Xtera Topco Ltd.)
• Original Assignee: Xtera Communications Incorporated (Xtera Topco Ltd.)
• Inventors: Barnes, Stuart, Chown, Martin, Webb, Stephen M
• Granted Patent: US 8,971,171 B2
• Time in Patent Office: Days
• US Class Current: 375/261
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0063 Single parity check
• CPC Class Codes: H04L 25/14 Channel dividing arrangements , i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver

Abstract

A transmission system for transmitting data over a channel in the form of a digital signal comprising bits of data, the system comprising an encoder for encoding the data prior to transmission, the encoder producing coding in the form of an overhead, and a decoder for decoding the data after transmission, characterised in that a first portion only of the data is encoded, the second portion remaining uncoded, the system further comprising a partitioner for partitioning the overhead from the uncoded data portion of the signal, after the first portion data has been encoded.

Claims

1. A transmission system for transmitting data in the form of a digital signal comprising an information sequence, the data being transmitted at a predetermined rate, the system comprising a FEC encoder for transforming the information sequence into

a partitioner for partitioning the encoded sequence into a plurality of sequence portions, so that the encoded sequence is transmitted as a plurality of separate channels,

wherein the sequence portions are transmitted at a rate which is lower than, and not equal to, the predetermined rate.

2. A transmission system according to claim 1 wherein the partitioner partitions the encoded sequence between two channels such that one part of the encoded sequence is identical to the information sequence and the other part is equivalent to the coding overhead.

3. A transmission system according to claim 1 further comprising a decoder for decoding the encoded sequence after transmission.

4. A transmission system according to claim 1 further comprising a recombiner for recombining the encoded sequence after transmission.

5. A transmission system according to claim 1 wherein the partitioner comprises a Quadrature Phase Shift Keying Modulation (QPSK).

6. A transmission system according to claim 4 wherein the partitioner comprises a phased modulator.

7. A transmission system according to claim 6 wherein the combiner comprises a phase modulator and amplitude.

8. A transmission system according to claim 4 wherein the partitioner comprises a wavelength multiplexer.

9. A transmission system according to claim 1 comprising at least one waveguide.

10. A transmission system according to claim 9 wherein the waveguides are optical waveguides.

11. A transmission system according to claim 10 wherein the partitioner comprises the coupler which connects a first waveguide to a second waveguide.

12. A method of transmitting data in the form of a digital signal comprising an information sequence, the data being transmitted at a predetermined rate, the method including applying forward error correcting code to the information sequence to transform the information sequence to an encoded sequence comprising the information sequence and a coding overhead, partitioning the encoded sequence into a plurality of sequence portions, transmitting the encoded sequence over a plurality of channels such that the sequence portions are transmitted at a rate which is lower than, and not equal to, the predetermined rate, recombining the encoded sequence and applying forward error correcting decoding to the encoded sequence after transmission.

13. A method according to claim 12 further comprises a step of applying error detection overhead to the information sequence prior to transmission of the information sequence.

14. An encoding system for encoding a digital signal comprising an information sequence, the encoding system comprising:

a FEC encoder for encoding the information sequence into an encoded sequence comprising the information sequence and a FEC coding;

a partitioner for partitioning the encoded sequence into a plurality of sequence portions such that each sequence portion maybe transmitted on a different channel;

wherein the sequence portions are transmitted at a rate which is lower than, and not equal to the predetermined rate.

15. A transmission system substantially as herein before described with reference to the accompanying drawings.

16. A method substantially as herein before described with reference to the accompanying drawings.

17. An encoder substantially as herein before described with reference to the accompanying drawings.

18. (canceled)