Flexible grid optical spectrum transmitter, receiver, and transceiver

• US 10,200,145 B2
• Filed: 12/07/2016
• Issued: 02/05/2019
• Est. Priority Date: 08/26/2010
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Boertjes, David W., Belanger, Michel
• Primary Examiner(s): Sandhu, Amritbir K
• Application Number:
  US15/371,552
• Publication Number:
  US 20170085335A1
• Time in Patent Office: 790 Days
• Field of Search: 398 48, 398 68, 398 69, 398 72, 398 79
• CPC Class Codes: H04J 14/0204 Broadcast and select arrangements, e.g. with an optical splitter at the input before 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 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0257 Wavelength assignment algorithms
• CPC Class Codes: H04Q 11/0066 Provisions for optical burst or packet networks
• CPC Class Codes: H04Q 2011/0016 using wavelength multiplexing or demultiplexing
• CPC Class Codes: H04Q 2011/0086 Network resource allocation, dimensioning or optimisation

Abstract

A flexible grid optical transceiver communicatively coupled to an optical network includes a coherent optical transmitter configured to generate a transmit signal at a first frequency/wavelength center and spanning a first one or more bins of optical spectrum; and a coherent optical receiver configured to receive a receive signal at a second frequency/wavelength center and spanning a second one or more bins of optical spectrum, wherein a size of each of the first one or more of bins and the second one or more of bins is based on a required roll off of a wavelength selective component in the optical network.

Claims

1. A flexible grid optical transmitter communicatively coupled to an optical network, the flexible optical transmitter comprising:

a coherent optical transmitter configured to generate a signal at a respective frequency/wavelength center and spanning a plurality of bins of optical spectrum, wherein the coherent optical transmitter is tunable to generate the signal at the respective frequency and/or wavelength center with a dynamic range wide enough to generate the signal at any respective frequency and/or wavelength center in the optical spectrum,

wherein a size of each of the plurality of bins is based on a required roll off of a wavelength selective component in the optical network.

2. The flexible grid optical transmitter of claim 1, wherein a number of the plurality of bins is based on a baud rate of the signal.

3. The flexible grid optical transmitter of claim 1, wherein the respective frequency and/or wavelength center and the plurality of bins of optical spectrum are provided to the coherent optical transmitter by a management system which manages the optical spectrum as flexible spectrum.

4. The flexible grid optical transmitter of claim 1, wherein the signal utilizes any of duo-binary, quadrature amplitude modulation (QAM), differential phase shift keying (DPSK), differential quadrature phase shift keying (DQPSK), orthogonal frequency-division multiplexing (OFDM), and polarization multiplexing with any of the foregoing.

5. A flexible grid optical transceiver communicatively coupled to an optical network, the flexible optical transceiver comprising:

a coherent optical transmitter configured to generate a transmit signal at a first frequency and/or wavelength center and spanning a first plurality of bins of optical spectrum, wherein the coherent optical transmitter is tunable to generate the transmit signal at the first frequency and/or wavelength center and the coherent optical transmitter has a dynamic range wide enough to generate the signal at any frequency and/or wavelength center in the optical spectrum; and

a coherent optical receiver configured to receive a receive signal at a second frequency and/or wavelength center and spanning a second plurality of bins of optical spectrum, wherein the signal utilizes any one of duo-binary modulation, quadrature amplitude modulation (QAM), differential phase shift keying (DPSK), differential quadrature phase shift keying (DQPSK), and orthogonal frequency-division multiplexing (OFDM),

wherein a size of each of the first plurality of bins and the second plurality of bins is based on a required roll off of a wavelength selective component in the optical network.

6. The flexible grid optical transceiver of claim 5, wherein a number of the first plurality of bins and the second plurality of bins is based on a baud rate of the transmit signal and the receive signal, respectively.

7. The flexible grid optical transceiver of claim 5, wherein the first frequency and/or wavelength center, the second frequency and/or wavelength center, the first plurality of bins, and the second plurality of bins are provided to the coherent optical transceiver by a management system which manages the optical spectrum as flexible spectrum.

8. The flexible grid optical transceiver of claim 5, wherein the coherent optical receiver is tunable to receive the receive signal at the respective frequency and/or wavelength center.

9. The flexible grid optical transceiver of claim 5, wherein the coherent optical receiver selects the receive signal from the optical spectrum while rejecting other signals present.

10. The flexible grid optical transceiver of claim 5, wherein the signal also utilizes polarization multiplexing.