Receiving device and optical switching fabric apparatus

• US 9,749,720 B2
• Filed: 11/11/2015
• Issued: 08/29/2017
• Est. Priority Date: 05/13/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Cao, Shiyi
• Primary Examiner(s): Liu, Li
• Application Number:
  US14/938,614
• Publication Number:
  US 20160066071A1
• Time in Patent Office: 657 Days
• CPC Class Codes: H04J 14/00 Optical multiplex systems
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/08 Time-division multiplex systems
• CPC Class Codes: H04Q 11/0003 Details
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0009 using wavelength filters
• CPC Class Codes: H04Q 2011/0015 using splitting combining
• CPC Class Codes: H04Q 2011/002 using optical delay lines or optical buffers or optical recirculation
• CPC Class Codes: H04Q 2011/0033 using time division switching
• CPC Class Codes: H04Q 2011/0039 Electrical control
• CPC Class Codes: H04Q 2011/0045 Synchronisation
• CPC Class Codes: H04Q 2011/005 Arbitration and scheduling

Abstract

The present invention provides a receiving device and an optical switching fabric apparatus, where the receiving device includes: multiple selecting modules, a fast optical switch connecting to each selecting module, an output module connecting to all the fast optical switches, and a receiver connecting to the output module, where the selecting module is configured to receive a multiwavelength optical signal, select and filter a first optical signal of a preset time segment in the multiwavelength optical signal; the fast optical switch is configured to select a second optical signal from the first optical signal filtered by the selecting module; the output module is configured to combine optical signals separately selected by all the fast optical switches into one optical burst signal; and the receiver is configured to perform optical-to-electrical conversion on the optical burst signal, and extract service data from an electrical signal.

Claims

1. A receiving device, comprising:

at least two selecting modules, each selecting module configured to receive a multiwavelength optical signal, filter a first optical signal of a set time segment from the multiwavelength optical signal, and output the first optical signal, wherein the first optical signals separately output by the at least two selecting modules partly overlap in time;

a fast optical switch connected to each of the at least two selecting module, the fast optical switch configured to receive each respective first optical signal, select a second optical signal from each respective first optical signal filtered by the respective selecting module, and output the second optical signals, wherein the second optical signals output by the fast optical switch do not overlap in time;

an output module connected to the fast optical switch, the output module configured to receive the second optical signals and combine the second optical signals separately selected by the fast optical switch into one optical burst signal, and output the optical burst signal;

a receiver connected to the output module, the receiver configured to receive the optical burst signal, perform optical-to-electrical conversion on the optical burst signal to obtain an electrical signal, extract service data from the electrical signal, and output the service data; and

a receiving clock generating module separately connected to each selecting module and separately connected to the fast optical switch, the receiving clock generating module configured to generate an optical burst frame header clock for use by the selecting module and the fast optical switch, based on a data clock received from the receiver, so that the receiving device is synchronous with an optical burst frame header clock sent by a sending device in an optical switching fabric apparatus.

2. The receiving device according to claim 1, wherein the at least two selecting modules are disposed in a serial manner.

3. The receiving device according to claim 1, further comprising:

an input module separately connected to the at least two selecting modules, the input module configured to receive a multiwavelength optical signal sent by a wavelength broadcasting device in the optical switching fabric apparatus, split the multiwavelength optical signal into multiple multiwavelength optical signals, and input each multiwavelength optical signal to a corresponding selecting module, wherein the number of multiwavelength optical signals is the same as that of the selecting modules.

4. The receiving device according to claim 3, wherein the at least two selecting modules are disposed in a parallel manner.

5. The receiving device according to claim 3, wherein the input module is a one-input multi-output splitter.

6. The receiving device according to claim 1, wherein:

the output module is a multi-input one-output combiner.

7. The receiving device according to claim 1, wherein:

the selecting module is a microring.

8. The receiving device according to claim 1, wherein:

the at least two selecting modules comprise a first selecting module and a second selecting module; and

the fast optical switch comprises a first fast optical switch connected to the first selecting module and a second fast optical switch connected to the second selecting module;

when the first selecting module is connected to the second selecting module in parallel, the first selecting module splits, from the multiwavelength optical signal, an optical signal corresponding to a first time segment, and the second selecting module splits, from the multiwavelength optical signal, an optical signal corresponding to a second time segment;

when the first selecting module is connected to the second selecting module in series, the first selecting module splits, from the multiwavelength optical signal, the optical signal corresponding to the first time segment, and sends the remaining optical signal to the second selecting module, and the second selecting module splits, from the remaining optical signal, the optical signal corresponding to the second time segment;

the optical signal corresponding to the first time segment partly overlaps with the optical signal corresponding to the second time segment in the time, the optical signal corresponding to the first time segment at least completely comprises an optical signal on a first selected wavelength and in a first selected timeslot, the optical signal corresponding to the second time segment at least completely comprises an optical signal on a second selected wavelength and in a second selected timeslot, and the optical signal on the first selected wavelength does not overlap with the optical signal on the second selected wavelength in the time;

the first fast optical switch splits the optical signal on the first selected wavelength from the optical signal corresponding to the first time segment, and the second fast optical switch splits the optical signal on the second selected wavelength from the optical signal corresponding to the second time segment; and

the output module combines the optical signal on the first selected wavelength and the optical signal on the second selected wavelength into one optical burst signal and outputs the optical burst signal to the receiver.

9. An optical switching fabric apparatus, comprising:

a sending device configured to receive an electrical signal comprising service data, convert the electrical signal into an optical signal by using a preconfigured wavelength, and output the optical signal;

a wavelength broadcasting device configured to receive the optical signal and output the optical signal; and

a receiving device according claim 1, the receiving device further configured to acquire service data in the optical signal and output the service data.

10. The apparatus according to claim 9, further comprising:

a clock source configured to generate a synchronous clock source of the apparatus; and

a scheduling module connected to the clock source and to the wavelength broadcasting device, the scheduling module configured to perform dynamic scheduling on the optical signal of the sending device, and perform selection and reception, by a service scheduling device, in a timeslot specified by the scheduling module.

11. The apparatus according to claim 10, wherein the sending device comprises:

a transmitter configured to convert an electrical signal into an optical signal; and

a sending clock generating module, configured to track the synchronous clock source generated by the clock source, and generate a data clock that needs to be sent by the transmitter and an optical burst frame header clock that needs to be sent by the transmitter.

12. The apparatus according to claim 10, wherein the wavelength broadcasting device comprises:

a combiner, an optical amplifying unit, a first splitter, and a second splitter, wherein

a combiner configured to receive optical signals sent by at least two sending devices, combine the received optical signals to form the multiwavelength optical signal, and output the multiwavelength optical signal;

a second splitter configured to receive and split the multiwavelength optical signal into at least a first and a second multiwavelength optical signal, wherein the first multiwavelength optical signal is sent to the optical amplifying unit, and the other multiwavelength optical signal is sent to the scheduling module of the optical switching fabric apparatus;

an optical amplifying unit configured to receive the first multiwavelength optical signal and output the first multiwavelength optical signal; and

a first splitter configured to receive the first multiwavelength optical signal and an optical signal output from the scheduling module, split the optical signal of the scheduling module and the first multiwavelength optical signal into multiple multiwavelength optical signals, and output each of the multiple multiwavelength optical signals to a corresponding receiving device.

13. The apparatus according to claim 9, wherein the sending device comprises:

a transmitter configured to convert an electrical signal into an optical signal.

14. The apparatus according to claim 9, wherein the wavelength broadcasting device comprises:

a combiner, an optical amplifying unit, and a first splitter, wherein

a combiner configured to receive optical signals sent by at least two sending devices, combine the received optical signals to form the multiwavelength signal, and output the multiwavelength signal;

an optical amplifying unit configured to receive the multiwavelength optical signal, amplify the multiwavelength optical signal, and output an amplified multiwavelength optical signal; and

a first splitter configured to split the amplified multiwavelength optical signal into multiple optical signals, and send each optical signal to a corresponding receiving device.