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 method for adjusting transmission power levels in a data communication system, the method comprising:
receiving an optical signal transmission transmitted over an optical communication link via a first optical communication interface, the optical signal transmission being characterized by a signal level and a noise level, the optical signal transmission being received from a transmitter device;
converting the optical signal transmission to an electrical signal transmission;
amplifying the electrical signal transmission via a TIA;
calculating a set of threshold levels based on at least the signal level and the noise level using a processor 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;
encoding the power transmission levels;
sending the encoded power transmission levels to the transmitter device via a second optical communication interface; and
modulating the optical signal transmission using a silicon photonics based PAM modulator.
2. The method of claim 1 further comprising providing an analog to digital converter for converting the amplified electrical transmission to digital signals.
3. The method of claim 1 further comprising configuring a PAM modulation driver for driving the encoded power transmission levels.
4. The method of claim 1 further comprising using a laser for producing optical signals.
5. The method of claim 4 , wherein adjusting the transmission power levels comprises configuring the PAM modulator to convert electrical signals via multiple channels to optical signals using the laser, and transmitting the optical signals in a PAM format at a rate selected from 40 Gbps, 100 Gbps, 400 Gbps, 3.2 Tbps.
6. The method of claim 1 wherein the adjusting transmission power levels comprises sending data to the network interface device based on the encoded power transmission power level.
7. The method 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.
8. The method of claim 1 wherein adjusting the transmission power levels comprises initializing the threshold levels at a start stage.
9. The method of claim 1 wherein adjusting the transmission power levels comprises initializing the transmission power levels at a start stage.
10. The method of claim 1 wherein the first optical communication interface is part of a spine switch of the leaf-spine network architecture.
11. The method of claim 1 wherein the first optical communication interface is part of a leaf switch of the leaf-spine network architecture.
12. The method of claim 1 wherein the first optical communication interface is part of a server of the leaf-spine network architecture.
13. The method of claim 1 further comprising coupling a Phase Lock Loop (PLL) to the data communication system.
14. The method of claim 13 further comprising configuring the PLL to perform clock recovery from data.
15. The method of claim 1 wherein the TIA further includes a limiting amplifier.
16. The method of claim 1 wherein adjusting the transmission power levels comprises configuring the TIA to perform electrical dispersion compensation.
17. The method of claim 1 further comprising integrating a functional block configured to perform error correction into the data communication system.
18. The method of claim 17 wherein the error correction comprises Forward Error Correction (FEC).
19. The method of claim 1 wherein the photodiode comprises a semiconductor-based photodiode.
20. The method of claim 1 further comprising providing the data communication system in a cloud computing center.
21. The method of claim 1 further comprising providing the data communication system in a data center.
22. The method of claim 1 further comprising integrating a plurality of non-blocking spine switches into the data communication system.
23. The method of claim 1 further comprising integrating a plurality of server nodes coupled to each other into the data communication system.