Wavelength-switched optical add-drop multiplexer with wavelength broadcasting capability

• US 8,625,993 B2
• Filed: 01/08/2008
• Issued: 01/07/2014
• Est. Priority Date: 01/08/2008
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Bhatnagar, Vipul, Sridhar, Balakrishnan
• Primary Examiner(s): Sedighian, M. R.
• Application Number:
  US11/970,575
• Publication Number:
  US 20090175620A1
• Time in Patent Office: 2,191 Days
• Field of Search: 398/83, 398/82, 398/79, 398/45, 398/84, 398/43
• US Class Current: 398/83
• CPC Class Codes: G02B 6/29383 Adding and dropping
• CPC Class Codes: G02B 6/3518 the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device MEMS devices in general B81B; manufacture of MEM devices in general B81C; micromechanical devices controlling the direction of light G02B26/0833
• CPC Class Codes: H04J 14/0205 Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
• CPC Class Codes: H04J 14/0206 Express channels arrangements
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0213 Groups of channels or wave bands arrangements
• CPC Class Codes: H04J 14/0217 Multi-degree architectures, e.g. having a connection degree greater than two
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0015 using splitting combining
• CPC Class Codes: H04Q 2011/0047 Broadcast; Multicast

Abstract

The present invention provides a wavelength-switched reconfigurable optical add-drop multiplexer (R-OADM) with wavelength broadcasting capability, such that asymmetric video signal distribution and the like can be performed without sacrificing with respect to component complexity and expense. The present invention utilizes an optical splitting and combining device with the wavelength-switched R-OADM to allow the R-OADM to support network-wide wavelength broadcasts without requiring external regeneration and extra optical transceiver equipment.

Claims

1. A wavelength-switched reconfigurable optical add-drop multiplexer with wavelength broadcasting capability, comprising:

a wavelength selective switch comprising an input port operable for receiving an input optical signal and a plurality of output ports operable for outputting a plurality of output optical signals, wherein at least one of the plurality of output ports is designated as a broadcast port, and wherein the broadcast port is operable for outputting an output optical signal that is to be both locally received and broadcast;

a splitter coupled to the broadcast port of the wavelength selective switch, wherein the splitter splits the output optical signal outputted by the broadcast port into a locally received optical signal and a broadcast optical signal; and

a combiner located between the broadcast port of the wavelength selective switch and the splitter, collectively, and a first multiplexer, wherein the combiner combines the broadcast optical signal received from the broadcast port and the splitter, collectively, with a plurality of locally added optical signals multiplexed by the first multiplexer prior to transmitting a resulting signal to a second multiplexer for multiplexing of the resulting signal with an express optical signal.

2. The wavelength-switched reconfigurable optical add-drop multiplexer of claim 1, further comprising a demultiplexer coupled to the splitter and operable for demultiplexing the locally received broadcast signal.

3. The wavelength-switched reconfigurable optical add-drop multiplexer of claim 2, further comprising one or more receivers coupled to the demultiplexer and operable for receiving the locally received optical signal.

4. The wavelength-switched reconfigurable optical add-drop multiplexer of claim 1, wherein the express optical signal comprises one or more express optical signals received from the wavelength selective switch.

5. A wavelength broadcasting method, comprising:

receiving an optical signal;

splitting the optical signal into a locally received optical signal and a broadcast optical signal;

locally receiving the locally received optical signal;

using a combiner located between a broadcast port of a wavelength selective switch and a splitter, collectively, and a first multiplexer, combining the broadcast optical signal received from the broadcast port and the splitter, collectively, with a plurality of locally added optical signals multiplexed by the first multiplexer and transmitting a resulting signal to a second multiplexer for multiplexing of the resulting signal with an express optical signal; and

broadcasting the broadcast optical signal.

6. The wavelength broadcasting method of claim 5, further comprising demultiplexing the locally received optical signal prior to locally receiving the locally received optical signal.

7. The wavelength broadcasting method of claim 5, wherein the express optical signal comprises one or more express optical signals received from the wavelength selective switch.

8. A multi-degree wavelength-switched reconfigurable optical add-drop multiplexer with wavelength broadcasting capability, comprising:

a wavelength selective switch comprising an input port operable for receiving an input optical signal and a plurality of output ports operable for outputting a plurality of output optical signals, wherein at least one of the plurality of output ports is designated as a broadcast port, and wherein the broadcast port is operable for outputting an output optical signal that is to be both locally received and broadcast;

a 1;

N splitter coupled to the broadcast port of the wavelength selective switch, wherein the 1;

N splitter splits the output optical signal outputted by the broadcast port into a locally received optical signal and N broadcast optical signals, wherein N comprises a number of degrees and is an integer; and

a combiner located between the broadcast port of the wavelength selective switch and the 1;

N splitter, wherein the combiner combines a broadcast optical signal received from the broadcast port with a locally added broadcast optical signal, and wherein the combiner outputs the combination of the broadcast optical signal and the locally added broadcast optical signal to the 1;

N splitter.

9. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 8, further comprising:

a wavelength selective combiner comprising a plurality of input ports operable for receiving input optical signals and an output port operable for outputting an output optical signal;

wherein an output of the 1;

N splitter is coupled to one of the plurality of inputs.

10. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 9, wherein at least one of the number of degrees couples a broadcast optical signal for combination in one of the plurality of inputs.

11. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 10, wherein the wavelength selective combiner is configured to selectively combine optical signals from the plurality of inputs to the output.

12. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 8, further comprising a demultiplexer coupled to the 1:

N splitter and operable for demultiplexing the locally received optical signal.

13. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 12, further comprising one or more receivers coupled to the demultiplexer and operable for receiving the locally received optical signal.

14. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 13, further comprising a multiplexer coupled to the combiner and operable for multiplexing the combined broadcast optical signal and one or more other optical signals with one or more other optical signals.

15. The multi-degree wavelength-switched reconfigurable optical add-drop multiplexer of claim 14, wherein the one or more other optical signals comprise one or more express optical signals received from the wavelength selective switch.