公开(公告)号：US20240430006A1

公开(公告)日：2024-12-26

申请号：US18214487

申请日：2023-06-26

Applicant: RAYTHEON COMPANY

Inventor： David Byron Borlaug

IPC: H04B10/11 ,  H04B10/516

Abstract: Circuit and method for electro-optic modulation of an RF signal to produce a single-sideband reduced-carrier phase-shifted (SSB-RC-PS) modulated signal includes: receiving an optical carrier signal; receiving the RF signal; modulating the RF signal with a first portion of the optical carrier to produce a single sideband (SSB) modulated signal; amplitude and phase modulating a second portion of the optical carrier signal and combining with the modulated signal to produce a first combined signal, the amplitude modulation and phase modulation of the second portion of the optical carrier signal are dynamically controlled to directly match the amplitude and inversely match the phase of the modulated signal; and amplitude modulating and phase modulating a third portion of the optical carrier signal and combining third portion with the first combined signal to produce the second combined signal, the product of which is a single sideband reduced carrier phase shifted (SSB-RC-PS) modulated signal.

公开(公告)号：US20240356653A1

公开(公告)日：2024-10-24

申请号：US18137005

申请日：2023-04-20

Applicant: Raytheon Company

Inventor： David Byron Borlaug

IPC: H04B10/54 ,  G02F1/21

CPC classification number: H04B10/54 ,  G02F1/212

Abstract: A communication system includes a laser that generates a laser light and a modulator that includes a modulation element configured to modulate the laser light with an input signal based on a bias voltage to produce an output signal. Control circuitry provides the bias voltage to a bias input of the modulation element and is configured to maintain a bias lock on at least two bias points of the modulation element during operation. The control circuitry is programmed to perform a bias lock operation that includes performing an initial voltage sweep on the modulation element and establish initial bias values for the at least two bias points. The circuit also providing a bias waveform to the bias input of the modulation element that varies over time and contains identifiable dither tones, determines harmonic power at the at least two bias points; and varies the bias waveform to determine harmonic power until the harmonic power is minimized to establish a bias lock with locked bias values.