# US 5,703,706 A · Spectral modification through phase modulation with spatial extent

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- Number: US 5,703,706 A
- Document ID: US5703706A
- Status: Granted
- Kind: A
- Application number: 08/585,128
- Filed: 1996-01-11
- Granted: 1997-12-30
- Earliest claimed: 1994-09-16
- Assignees: Varian Associates, Inc.
- Inventors: James N. Eckstein; Majid L. Riaziat; Gary F. Virshup
- Web page: https://patentgrep.com/patent/US5703706A

## CPC

- H04B 10/25077: {using soliton propagation}
- G01J 3/433: Modulation spectrometry; Derivative spectrometry
- G02F 1/0356: {controlled by a high-frequency electromagnetic wave component in an electric waveguide structure}
- G02F 2/02: Frequency-changing of light, e.g. by quantum counters
- H04B: TRANSMISSION
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

An optical pulse propogating in an optical guide of an electro-optic medium interacts with a coplanar RF traveling wave to shift the optical wavelength. The RF phase is resynchronized to the optical pulse phase with spatial periodicity to provide a desired phase relationship between RF and optical radiation. A unidirectional incremental wavelength shifter comprises a frequency multiplexer for soliton communication and a symmetrical sideband modulator of this type varies the spectral width of probe illumination in an atomic absorption spectrometer probe beam.

## Claims

### Claim 1

A multichannel optical communication system comprising
(a) a source of optical solitons of selected wavelength,
(b) a multiplexer for separating a plurality of trains of solitons from said source,
(c) a plurality of wavelength shifters, each said wavelength shifter operative upon a corresponding train of solitons to shift the wavelength of said train of solitons to a desired value,
(d) a plurality of modulation means, each said modulation means operative upon a corresponding train of solitons to vary the amplitude of the solitons thereof whereby information is impressed upon said train of solitons,
(e) demultiplexer means for recombining said plurality of trains of solitons to propogate over an optical fiber,
(f) wavelength dispersive means for receiving said plurality of trains of solitons and directing solitons of like wavelength to propagate over one of a corresponding plurality of optical paths.