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1. (US20190094573) METHOD FOR GENERATING OPTICAL SIGNAL, AND DEVICE FOR GENERATING OPTICAL SIGNAL

Office : United States of America
Application Number: 16079096 Application Date: 23.02.2017
Publication Number: 20190094573 Publication Date: 28.03.2019
Publication Kind : A1
Prior PCT appl.: Application Number:PCTJP2017006902 ; Publication Number: Click to see the data
IPC:
G02F 1/01
G02F 1/225
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
21
by interference
225
in an optical waveguide structure
CPC:
G02F 1/0123
G02F 1/225
G02F 2001/212
Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
Inventors: Atsushi KANNO
Tetsuya KAWANISHI
Priority Data: 2016-033572 24.02.2016 JP
Title: (EN) METHOD FOR GENERATING OPTICAL SIGNAL, AND DEVICE FOR GENERATING OPTICAL SIGNAL
Abstract: front page image
(EN)

To provide a method whereby a bias voltage capable of easily realizing a required extinction ratio can be controlled by utilizing a high-extinction ratio modulator even when a generic AD converter/control board is used, and a device for realizing the method. In the present invention, the step quantity (variation quantity) ΔV of a control voltage is no more than 0.1 times the half-wave voltage Vπ [V]. For example, in the case of searching for the minimum point, the light intensity is measured when a bias that is larger by the step voltage ΔV and a bias that is smaller by the step voltage ΔV are applied, the current bias voltage being used as a reference, and the bias voltage is moved toward the smaller of the measured light intensities. The process of setting the moved bias voltage as a reference, comparing the light intensities for the bias points in both neighboring positions, and changing the reference bias voltage is then repeated. A configuration may be adopted whereby ΔV then gradually decreases in accordance with a predetermined algorithm.


Also published as:
CN108700760WO/2017/146166