Recent Patents

Isolated Photonic Transmitter And Detector

Document ID: US 11209675 B1  Date Published:12/28/2021

Inventors: Dr. Yifei Li and Dr. Tariq Manzur

An optically biased photonic link receives a radio frequency (RF) signal and includes a signal laser joined to an optical intensity modulator. A low noise amplifier receives the RF signal and provides an amplified signal to the modulator. The modulator converts the signal into an optical signal. The amplifier and modulator are powered by a photovoltaic array. The array receives power from a remotely located power laser. The optical signal is received by a link receiver which provides an analysis signal and an output signal. A bias logic circuit uses the analysis signal to provide an optical bias signal to an optical detector joined to modulator. The optical detector provides a responsive bias voltage to the modulator.


Active Modulator With Integrated LNA Driver

Document ID: US 11163206 B1  Date Published:11/02/2021

Inventors: Dr. Yifei Li and Dr. Tariq Manzur

An active optical modulator receives a radio frequency signal and provides an intensity modulated optical signal. The optical modulator is formed on a substrate having a doped region. An interferometer is formed on the substrate having a first path and a second path. A low noise amplifier receives the radio frequency signal and provides an electrical field to the paths. A signal laser provides an optical signal to the interferometer which is modulated and interfered to produce an intensity modulated optical signal. A pump laser provides an optical gain signal to the interferometer where it adds gain to the optical signal in the interferometer by interaction with the doped region of the substrate.


Pulsed Sagnac Loop Phase-Modulated Microwave Photonic Link

Document ID: US 10812197 B1  Date Published:10/20/2020

Inventors: Dr. Yifei Li

A modified Sagnac loop phase – modulated microwave pho tonic link with a pulsed optical source is disclosed. Unlike a conventional Sagnac loop, the optical phase offset of the loop can be adjusted to quadrature by applying a synchronized modulation signal to an in-loop phase shifting phase modulator. Thereby, it exemplifies the fundamental RF response.