Magneto-Optic Modulator

Tech ID: 32583 / UC Case 2020-701-0


Modulation, the key to any communication system, is the adjustment of the frequency, phase, or amplitude of a carrier wave to transfer information. In a typical optical communication system, the modulation is performed through the electro-optic effect where the phase or the amplitude of light is modulated using a radio frequency (RF) signal. Integrated electro-optics exist, but they are limited by the complex integration of the material on a silicon photonics platform (e.g., lithium niobate). Material degradation, low modulation bandwidth, and the large absorption in the materials also limit the maximum modulation frequency.


Researchers at University of California, Santa Barbara have developed a novel integrated optical modulator based on the nonreciprocal phase shift in magneto-optic material. This invention can be efficiently implemented on any integrated optical waveguide, including silicon waveguides (e.g., bonding). Unlike semiconductors at RF, magneto-optic materials do not suffer from plasma free carrier absorption, and perform reliably over time. Compared to standard magneto-optic modulators, this invention does not require polarization filters, removing a difficult fabrication step in integrated optics. This technology can be effectively used as a low-loss electro-optic transducer and for sensing. The integration, broader modulation bandwidth, and low RF propagation loss can be beneficial to achieve lower power consumption compared to standard electro-optic modulators. This technology also operates over a wide temperature range that extends from room temperature to below 4 K, enabling efficient data links in large-scale systems for cryogenic supercomputing and quantum information processing.


  • Low-cost and large-scale efficient integration compared to other technologies
  • Easy packaging due to the novel design of the electric driving circuit
  • Minimal power and material consumption
  • No polarization filters required


  • Sensors & Instrumentation
  • Optics and Photonics
  • Communications
    • Optical
    • Networking
  • Semiconductors

Patent Status

Country Type Number Dated Case
Patent Cooperation Treaty Published Application 2023/004112 01/26/2023 2020-701

Additional Patent Pending

Related Materials


Learn About UC TechAlerts - Save Searches and receive new technology matches


Other Information


optic, modulator, modulation, network, waveguide, RF, bandwith, data, supercomputing, quantum, sensing

Categorized As