Intra data center optical communication
A system, a non-transitory computer readable media and a method for intra data center optical communication, the method may include (a) receiving an optical input signal by a coherent optical receiver of a second unit of a data center; wherein each input optical signal represents a transmitted optical signal that was transmitted by a coherent transmitter of a first unit of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter; (b) generating, by a controllable laser of the coherent optical receiver, a reference signal; wherein a frequency of the reference signal is controlled by a processor of the coherent optical receiver; and (c) recovering data embedded in the optical input signal; wherein the recovering of the data comprises optically processing the reference signal and the optical input signal.
1. A method for intra data center optical communication, the method comprises:
receiving an optical input signal by a coherent optical receiver of a second unit of a data center; wherein each input optical signal represents a transmitted optical signal that was transmitted by a coherent transmitter of a first unit of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter;
generating, by a controllable laser of the coherent optical receiver, a reference signal;
controlling a frequency of the reference signal by a processor of the coherent optical receiver independently from a control of the laser of the coherent transmitter; wherein the controlling comprises sending control commands selected out of increase frequency and decrease frequency; and
recovering data embedded in the optical input signal; wherein the recovering of the data comprises optically processing the reference signal and the optical input signal.
2. The method according to claim 1 wherein a power of the reference signals is lower than a power of the transmitter laser signal.
3. The method according to claim 1 wherein a power of the reference signals is not lower than a power of the transmitter laser signal.
4. The method according to claim 1 wherein the laser of the coherent transmitter is a non-tunable laser.
5. The method according to claim 1 wherein the laser of the coherent transmitter is a tunable laser.
6. The method according to claim 1 wherein the input optical signal is Coarse Wavelength Division Multiplexing (CWDM) compliant.
7. The method according to claim 1 wherein the input optical signal is Parallel Single mode Fiber (PSM) compliant.
8. The method according to claim 1 wherein the coherent optical receiver is included in a pluggable communication unit.
9. The method according to claim 1 wherein the coherent optical receiver is included in a non-pluggable communication unit.
10. The method according to claim 1 comprising transmitting by a coherent transmitter of the second unit another transmitted optical signal to another unit of the data center.
11. The method according to claim 1 wherein the first unit and the second unit are network elements selected out of a switch, a router, and a server.
12. The method according to claim 1 wherein the optically processing is followed by optical to digital conversion.
13. A non-transitory computer readable medium for intra data center optical communication, the non-transitory computer readable medium stores instructions for:
receiving an optical input signal by a coherent optical receiver of a second unit of a data center; wherein each input optical signal represents a transmitted optical signal that was transmitted by a coherent transmitter of a first unit of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter;
generating, by a controllable laser of the coherent optical receiver, a reference signal;
controlling a frequency of the reference signal by a processor of the coherent optical receiver independently from a control of the laser of the coherent transmitter; wherein the controlling comprises sending control commands selected out of increase frequency and decrease frequency; and
recovering data embedded in the optical input signal; wherein the recovering of the data comprises optically processing the reference signal and the optical input signal.
14. The non-transitory computer readable medium according to claim 13 wherein the input optical signal is Coarse Wavelength Division Multiplexing (CWDM) compliant.
15. The non-transitory computer readable medium according to claim 13 wherein the input optical signals is Parallel Single mode Fiber (PSM) compliant.
16. A network element, the network element comprises a coherent optical receiver, wherein the coherent optical receiver comprises:
an input that is configured to receive an optical input signal by a coherent optical receiver of a second unit of a data center; wherein the input optical
signal represents a transmitted optical signal that was transmitted by a coherent transmitter of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter;
a processor;
a controllable laser that is configured to generate a reference signal;
a processor that is configured to control, by sending control commands selected out of increase frequency and decrease frequency, a frequency of the reference signal independently from a control of the laser of the coherent transmitter;
optical circuitry that is configured to optically process the reference signal and the optical input signal; and
optical to digital conversion circuitry;
wherein the processor is also configured to recover data embedded in the optical input signal.
17. The method according to claim 1 comprising controlling a temperature of the controllable laser.
18. A method for intra data center optical communication, the method comprises:
receiving an optical input signal by a coherent optical receiver of a second unit of a data center; wherein each input optical signal represents a transmitted optical signal that was transmitted by a coherent transmitter of a first unit of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter;
generating, by a controllable laser of the coherent optical receiver, a reference signal; wherein a frequency of the reference signal is controlled by a processor of the coherent optical receiver independently from a control of the laser of the coherent transmitter; and
recovering data embedded in the optical input signal; wherein the recovering of the data comprises optically processing the reference signal and the optical input signal;
wherein the laser of the coherent transmitter is a tunable laser; and
wherein the controllable laser has a lower stability over temperature changes than the tunable laser.
19. A method for intra data center optical communication, the method comprises:
receiving an optical input signal by a coherent optical receiver of a second unit of a data center; wherein each input optical signal represents a transmitted optical signal that was transmitted by a coherent transmitter of a first unit of the data center; wherein the transmitted optical signal is generated by modulating a transmitter laser signal that is outputted from a laser of the coherent transmitter;
generating, by a controllable laser of the coherent optical receiver, a reference signal; wherein a frequency of the reference signal is controlled by a processor of the coherent optical receiver independently from a control of the laser of the coherent transmitter; and
recovering data embedded in the optical input signal; wherein the recovering of the data comprises optically processing the reference signal and the optical input signal;
wherein the laser of the coherent transmitter is a tunable laser; and
wherein the controllable laser has a frequency range that is narrower than a frequency range of the tunable laser.