Method and system for waveguide delay based equalization with current and optical summing in optical communication

1. A method for communication, the method comprising:

in an optoelectronic receiver comprising a directional coupler, two or more photodetectors, and one or more current mirrors:

receiving an input optical signal;

splitting the input optical signal into first and second optical signals using the directional coupler;

generating a first electrical signal from the first optical signal using a first photodetector;

generating a second electrical signal from the second optical signal using a second photodetector;

mirroring the second electrical signal using one of the one or more current mirrors; and

summing the first electrical signal with the mirrored second electrical signal.

2. The method according to claim 1 , comprising delaying the first optical signal before generating the first electrical signal.

3. The method according to claim 2 , comprising delaying the first optical signal using a waveguide delay.

4. The method according to claim 1 , comprising generating an equalized output voltage by coupling the summed first electrical signal and mirrored second electrical signal utilizing a transimpedance amplifier.

5. The method according to claim 1 , comprising splitting the second optical signal into third and fourth optical signals using a second directional coupler before generating the second electrical signal.

6. The method according to claim 5 , wherein the second photodetector comprises two inputs for receiving optical signals.

7. The method according to claim 5 , comprising delaying the fourth optical signal using a waveguide delay.

8. The method according to claim 7 , comprising coupling the delayed fourth optical signal to a third photodetector and summing its output current with an output current from the second photodetector.

9. The method according to claim 1 , comprising weighting the first and second optical signals by configuring a coupling coefficient of the directional coupler.

10. The method according to claim 1 , wherein the optoelectronic transceiver is on a silicon complementary-metal oxide semiconductor (CMOS) photonics die.

11. A system for communication, the system comprising:

an optoelectronic receiver comprising a directional coupler, two or more photodetectors, and one or more current mirrors, the optoelectronic receiver being operable to:

receive an input optical signal;

split the input optical signal into first and second optical signals using the directional coupler;

generate a first electrical signal from the first optical signal using a first photodetector;

generate a second electrical signal from the second optical signal using a second photodetector;

mirror the second electrical signal using one of the one or more current mirrors; and

sum the first electrical signal with the mirrored second electrical signal.

12. The system according to claim 11 , wherein the optoelectronic receiver is operable to delay the first optical signal before generating the first electrical signal.

13. The system according to claim 12 , wherein the optoelectronic receiver is operable to delay the first optical signal using a waveguide delay.

14. The system according to claim 11 , wherein the optoelectronic receiver is operable to generate an equalized output voltage by coupling the summed first electrical signal and mirrored second electrical signal utilizing a transimpedance amplifier.

15. The system according to claim 11 , wherein the optoelectronic receiver is operable to split the second optical signal into third and fourth optical signals using a second directional coupler before generating the second electrical signal.

16. The system according to claim 15 , wherein the second photodetector comprises two inputs for receiving optical signals.

17. The system according to claim 15 , wherein the optoelectronic receiver is operable to delay the fourth optical signal using a waveguide delay.

18. The system according to claim 15 , wherein the optoelectronic receiver is operable to couple the delayed fourth optical signal to a third photodetector and sum its output current with an output current from the second photodetector.

19. The system according to claim 11 , wherein the optoelectronic receiver is operable to weight the first and second optical signals by configuring a coupling coefficient of the directional coupler.

20. A system for communication, the system comprising:

an optoelectronic receiver comprising first and second directional couplers, first and second photodetectors, first and second waveguide delays, and a current mirror, the optoelectronic receiver being operable to:

receive an input optical signal;

split the input optical signal into first and second optical signals using the first directional coupler;

delay the first optical signal utilizing the first delay waveguide;

generate a first electrical signal from the delayed first optical signal using a first photodetector;

split the second optical signal into third and fourth optical signals;

delay the fourth optical signal using the second delay waveguide;

generate a second electrical signal from the third optical signal and the delayed fourth optical signal using the second photodetector;

mirror the second electrical signal using the current mirror; and

sum the first electrical signal with the mirrored second electrical signal.