Wavelength based optical power positioning for information and communications technology systems

• US 9,002,206 B2
• Filed: 07/10/2012
• Issued: 04/07/2015
• Est. Priority Date: 07/10/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Xu, Qing, Brunner, Robert, Lessard, Stephane
• Primary Examiner(s): PASCAL, LESLIE C
• Application Number:
  US13/545,200
• Publication Number:
  US 20140016934A1
• Time in Patent Office: 1,001 Days
• Field of Search: 398 81- 82, 398 91- 92
• US Class Current: 398/82
• CPC Class Codes: H04B 10/801 using optical interconnects, e.g. light coupled isolators, circuit board interconnections
• 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

Abstract

Wavelength-based optical power provisioning is provided by multiplexing a plurality of continuous wave light beams at different wavelengths onto a single optical fiber as a multiplexed light source and demultiplexing the multiplexed light source based on wavelength at a photonic unit coupled to the optical fiber to recover the continuous wave light beams. The recovered continuous wave light beams are split into a plurality of light beams by the photonic unit, each light beam having the same wavelength and the same or lower power as one of the recovered continuous wave light beams so that at least one of the light beams generated by the photonic unit has a higher power than the other light beams generated by the photonic unit.

Claims

1. A linecard, comprising:

an external light source port operable to input a multiplexed light source wherein the multiplexed light source comprises a plurality of continuous wave light beams at different wavelengths; and

a photonic unit comprising;

an optical demultiplexer operable to demultiplex the multiplexed light source based on wavelength to recover the continuous wave light beams; and

a plurality of optical power splitters each operable to input one of the recovered continuous wave light beams from the optical demultiplexer and output one or more light beams at the same wavelength and at the same or lower power as the light beam input to that optical splitter so that at least one of the light beams output by the optical splitters has a higher power than the other light beams output by the optical splitters,

wherein the photonic unit is operable to route one or more higher-power ones of the light beams output by the optical splitters off the linecard and one or more lower-power ones of the light beams output by the optical splitters to another photonic unit on the same linecard based on wavelength.

2. The linecard according to claim 1, further comprising a waveguide operable to carry the multiplexed light source to the photonic unit.

3. The linecard according to claim 1, wherein at least one of the optical splitters is operable to output a single higher-power light beam at the same wavelength and power as the light beam input to that optical splitter, and remaining ones of the optical splitters are each operable to output a plurality of lower-power light beams at the same wavelength and lower power than the light beam input to that optical splitter.

4. The linecard according to claim 3, wherein one of the remaining ones of the optical splitters is operable to input one of the recovered continuous wave light beams and output two lower-power light beams at the same wavelength and half the power as the light beam input to that optical splitter.

5. The linecard according to claim 3, wherein one of the remaining ones of the optical splitters is operable to input one of the recovered continuous wave light beams and output four lower-power light beams at the same wavelength and quarter the power as the light beam input to that optical splitter.

6. The linecard according to claim 1, wherein the optical splitters are reconfigurable so that the power and number of the light beams output by each optical splitter can be changed as a function of wavelength.

7. The linecard according to claim 1, comprising a plurality of the photonic units, wherein the photonic units are operable to provision optical power differently based on wavelength so that the highest-power light beam output by one of the optical splitters of one photonic unit has a different wavelength than the highest-power light beam output by one of the optical splitters of a different photonic unit.

8. The linecard according to claim 1, further comprising an optical component operable to direct light beams between photonic units on the linecard or to another linecard based on wavelength.

9. The linecard according to claim 8, wherein the optical component is a 1×

N optical multiplexer operable to provide a single trunk line from each photonic unit on the linecard.

10. The linecard according to claim 8, wherein the optical component is an arrayed waveguide grating router (AWGR) operable to route light beams between photonic units on the linecard or to another linecard based on wavelength.

11. The linecard according to claim 10, wherein the AWGR has a plurality of input ports and a plurality of output ports and routes light beams between the input and output ports so that one or more wavelengths ingress each input port and one or more wavelengths egress each output port, and wherein the AWGR is operable to control routing between the input and output ports based on wavelength.

12. The linecard according to claim 11, wherein each output port of the AWGR is operable to provide an optical link with equal channel power and different wavelengths from different photonic units.

13. A method of wavelength-based optical power provisioning comprising:

receiving a multiplexed light source comprising a plurality of continuous wave light beams at different wavelengths;

demultiplexing the multiplexed light source based on wavelength at a photonic unit disposed on a card, to recover the continuous wave light beams;

splitting the recovered continuous wave light beams into a plurality of light beams by the photonic unit, each light beam having the same wavelength and the same or lower power as one of the recovered continuous wave light beams so that at least one of the light beams generated by the photonic unit has a higher power than the other light beams generated by the photonic unit; and

routing one or more higher-power ones of the light beams generated by the photonic unit off the card and one or more lower-power ones of the light beams generated by the photonic unit to another photonic unit on the same card based on wavelength.

14. The method according to claim 13, further comprising provisioning optical power differently based on wavelength so that the highest-power light beam generated by one photonic unit on the card has a different wavelength than the highest-power light beam generated by a different photonic unit on the same card.

15. The method according to claim 13, further comprising directing light beams between photonic units on the same card or off the card based on wavelength.

16. The method according to claim 15, wherein the light beams are directed between photonic units on the same card or off the card based on wavelength by an arrayed waveguide grating router (AWGR).

17. The method according to claim 16, further comprising routing light beams between a plurality of input and output ports of the AWGR so that one or more wavelengths ingress each input port and one or more wavelengths egress each output port, and wherein the AWGR controls routing between the input and output ports based on wavelength.

18. The method according to claim 17, further comprising providing an optical link with equal channel power and different wavelengths from different photonic units on the same card via the AWGR.