Coherent Transceivers for Intra data center Co-Packaged Optical Links
As the bandwidth density requirement of intra-data center links keep on increasing, optical interconnects play a significantly important roles compared to the conventional electrical interconnects. Co-packaged optics, in contrary to the standard pluggable optics solutions, is capable of bringing a revolution in bandwidth density of optical interconnects due to the reduced length of electrical channels which increases the baud rate of data transfer. On the top of that, making the best use of different degrees of freedom of light, namely intensity, phase and polarization can help maximize the overall optical bandwidth per wavelength.
In my research project I’m designing a coherent electro-optic transceiver which is capable of achieving a data rate of 448 Gb/s per single wavelength of transmission. The transmitter utilizes Mach-Zehnder Modulators (MZMs) and several passive and active optical devices (such as thermal phase shifters, MMIs et.c) to combine 4 lanes of 112 Gb/s data-stream into a single fiber. I propose the use of carrier-injection based PIN-MZM in the data path to achieve higher performance compared to the conventional depletion-mode PN-MZM. Moreover, we use laser-forwarding scheme which simplifies the design of coherent-receiver to a great extent.
Expected Graduation Date:
May, 2025
