Optical Transmitter Equalization With Mismatched Terminations In A Mach-Zehnder Modulator

Researchers at the University of California, Santa Barbara have invented a new technique for optical equalization that enables optical links to operate at significantly higher data rates while also benefiting from the inherent broadband optical respons…

Researchers at the University of California, Santa Barbara have invented a new technique for optical equalization that enables optical links to operate at significantly higher data rates while also benefiting from the inherent broadband optical response and temperature insensitivity of TW-MZMs. This technology employs a termination circuit that introduces a tunable mismatch where the termination resistance is less than the driver-side impedance of the transmission line electrodes. Consequently, the termination has a tunable negative real reflection coefficient, and incident electrical waves are reflected in inverted form. As the leading edge of a forward-traveling electrical pulse (FTEP) arrives at the end of the electrode, an inverted backward-traveling electrical pulse (BTEP) starts to propagate. The BTEP produces an opposite phase change in the forward-traveling optical pulse (FTOP) compared to the FTEP. The accumulated phase change produced by the BTEP is largest at its trailing edge, resulting in a modulated optical signal with emphasis on the bit transitions. This invention also circumvents any alterations to the driver circuit and leverages monolithic electronic-photonic fabrication processes.

Website

https://techtransfer.universityofcalifornia.edu/NCD/32794.html?utm_source=AUTMGTP&utm_medium=webpage&utm_term=ncdid_32794&utm_campaign=TechWebsites

Advantages

  • Enhances bandwidth
  • Can reduce the bit error rate
  • Can be implemented monolithically
  • Variable termination resistance allows the reflection coefficient to be tuned for optimal performance

Potential Applications

  • Data centers
    • Optical transmitters & transceivers
  • Silicon photonics

Contact Information

Name: Robert Takara

Email: Takara@tia.ucsb.edu

Phone: 805-893-5138