Method, device, and system for implementing LR-PON

Patent metadata

Field	Value
Publication number	US-9219547-B2
Application number	US-201414158427-A
Country	US
Kind code	B2
Filing date	Jan 17, 2014
Priority date	Nov 3, 2008
Publication date	Dec 22, 2015
Grant date	Dec 22, 2015

Abstract

A method, device and system for implementing a long reach passive optical network are provided. Uplink optical burst packets are transmitted by an optical network unit. The uplink optical burst packets are converted into an electrical signal and then a continuous optical signal. The continuous optical signal is transmitted to a receiving device.

First claim

What is claimed is:

1. A method for processing uplink optical burst packets in a long reach passive optical network, the method comprising:
receiving the uplink optical burst packets transmitted by an optical network unit in a burst manner;
converting the uplink optical burst packets into an electrical signal;
determining an inter-packet gap between an uplink burst packet of the electrical signal and a next adjacent uplink burst packet of the electrical signal, wherein determining the inter-packet gap comprises:
obtaining an end position of the uplink burst packet of the electrical signal;
obtaining a start position of the next adjacent uplink burst packet of the electrical signal; and
determining the inter-packet gap according to the end position and the start position;
filling the inter-packet gap of the electrical signal with non-consecutive identical digit bits;
converting the electrical signal after being filled with the non-consecutive identical digit bits into a continuous optical signal; and
transmitting the continuous optical signal to a receiving device;
wherein a length of the non-consecutive identical digit bits meets a clock data recovery capability of the receiving device.

2. The method according to claim 1 , the method further comprising performing a byte rounding operation on the inter-packet gap.

3. The method according to claim 1 , wherein transmitting the continuous optical signal to the receiving device comprises transmitting the continuous optical signal to the receiving device in a continuous transmission mode.

4. The method according to claim 1 , wherein, after converting the uplink optical burst packets into the electrical signal, the method further comprises performing clock data recovery on the electrical signal.

5. The method according to claim 1 , wherein converting the uplink optical burst packets into the electrical signal comprises adjusting an optical power of the uplink optical burst packets to obtain an adjusted optical signal and converting the adjusted optical signal into the electrical signal.

6. The method according to claim 1 , further comprising amplifying and shaping the electrical signal to obtain an amplified and shaped electrical signal.

7. The method according to claim 6 , further comprising performing a clock data recovery on the amplified and shaped electrical signal to obtain a clock data recovered electrical signal, wherein converting the electrical signal into the continuous optical signal comprises converting the clock data recovered electrical signal into the continuous optical signal.

8. A device for processing uplink optical burst packets in a long reach passive optical network, the device comprising:
a receiver, configured to receive the uplink optical burst packets transmitted in a burst manner;
a converter, configured to
convert the uplink optical burst packets into an electrical signal;
determine an inter-packet gap between an uplink burst packet of the electrical signal and a next adjacent uplink burst packet of the electrical signal, wherein the converter is further configured to obtain an end position of the uplink burst packet of the electrical signal, obtain a start position of the next adjacent uplink burst packet of the electrical signal and determine the inter-packet gap according to the end position and the start position;
fill the inter-packet gap of the electrical signal with non-consecutive identical digit bits; and
convert the electrical signal after being filled with the non-consecutive identical digit bits into a continuous optical signal; and

a transmitter, configured to transmit the continuous optical signal to a receiving device;
wherein a length of the non-consecutive identical digit bits meets a clock data recovery capability of the receiving device.

9. The device according to claim 8 , wherein the converter is configured to perform a byte rounding operation on the inter-packet gap when determining the inter-packet gap.

10. The device according to claim 8 , the transmitter is configured to transmit the continuous optical signal to the receiving device in a continuous transmission mode.

11. An optical network system, comprising:
a relay device configured to:
receive uplink optical burst packets transmitted in a burst manner;
convert the uplink optical burst packets into an electrical signal;

obtaining an end position of the uplink burst packet of the electrical signal;
obtaining a start position of the next adjacent uplink burst packet of the electrical signal;
determining an inter-packet gap according to the end position and the start position;
fill the inter-packet gap of the electrical signal with non-consecutive identical digit bits;
convert the electrical signal after being filled with the non-consecutive identical digit bits into a continuous optical signal; and
transmit the continuous optical signal; and
a receiving device, configured to receive the continuous optical signal; and
wherein a length of the non-consecutive identical digit bits meets a clock data recovery capability of the receiving device.

12. The system according to claim 11 , further comprises an optical network unit, which is configured to transmit the uplink optical burst packets to the relay device in the burst manner.

13. The system according to claim 12 , wherein the receiving device comprises a reamplifying, reshaping, retiming device.

14. The system according to claim 12 , wherein the receiving device comprises an optical line terminal.

Assignees

• Huawei Tech Co Ltd
• Huawei Tech Co Ltd

Inventors

• Zhou Huiyu
• Ma Teng
• Huang Kun
• Chen Zhiyun

Classifications

• H04B10/272 Primary

  Star-type networks {or tree-type networks} · CPC title

• H04B10/27 Primary

  Arrangements for networking · CPC title

• H04B10/29

  Repeaters · CPC title

• H04J3/1694

  Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062) · CPC title