Method and system for transmitter optimization of an optical PAM serdes based on receiver feedback
View Patent ↗The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using PAM format(s) over optical communication networks. A feedback mechanism is provided for adjusting the transmission power levels. There are other embodiments as well.
1. A data communication system, the system comprising:
a network interface device comprising:
a first optical communication interface configured to receive an optical signal transmission transmitted over an optical communication link, the optical signal transmission being characterized by a signal level and a noise level, the optical signal transmission being received from a transmitter device;
a photodiode configured to convert the optical signal transmission to an electrical signal transmission;
a TIA configured to amplify the electrical signal transmission;
a processor configured to calculate a set of threshold levels based on at least the signal level and the noise level, the processor being configured to generate a set of power transmission levels for the transmitter device, the power transmission levels being based on at least one of the threshold levels, the power transmission levels being non-equispaced;
an encoder for encoding the power transmission levels;
a second optical communication interface for sending the encoded power transmission levels to the transmitter device; and
a leaf spine network architecture comprising a top of a rack switch.
2. The system of claim 1 further comprising an analog to digital converter for converting electrical amplified electrical transmission to digital signals.
3. The system of claim 1 further comprising a PAM modulation driver for driving the encoded power transmission levels.
4. The system of claim 1 further comprising a laser for driving output signals.
5. The system of claim 1 wherein the transmitter device adjust transmission power levels for sending data to the network interface based on the encoded power transmission power level.
6. The system of claim 1 wherein the noise level includes a signal independent component, a component proportional to the signal power, and a component proportional to the square of the signal power.
7. The system of claim 1 wherein the threshold levels are initialized at a start stage.
8. The system of claim 1 wherein the power transmission levels are initialized at a start stage.
9. The system of claim 1 further comprising a PAM driver configured to drive the encoded power transmission levels.
10. The system of claim 1 wherein the first optical communication interface is part of a spine switch of the leaf-spine network architecture.
11. The system of claim 1 wherein the first optical communication interface is part of a leaf switch of the leaf-spine network architecture.
12. The system of claim 1 wherein the first optical communication interface is part of a server of the leaf-spine network architecture.
13. The system of claim 1 further comprising a Phase Lock Loop (PLL).
14. The system of claim 13 wherein the PLL is configured to perform clock recovery from data.
15. The system of claim 1 wherein the TIA further includes a limiting amplifier.
16. The system of claim 1 wherein the TIA is configured to perform electrical dispersion compensation.
17. The system of claim 1 further comprising a functional block configured to perform error correction.
18. The system of claim 17 wherein the error correction comprises Forward Error Correction (FEC).
19. The system of claim 1 further comprising an Analog to Digital Converter.
20. The system of claim 1 wherein the photodiode comprises a semiconductor-based photodiode.
21. The system of claim 1 wherein the system is provided in a cloud computing center.
22. The system of claim 1 wherein the system is provided in a data center.
23. The system of claim 1 further comprising a plurality of non-blocking spine switches.
24. The system of claim 1 further comprising a plurality of server nodes coupled to each other.