# US 2025/0096904 A1 · Light intensity modulation device and waveform compression device

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- Number: US 2025/0096904 A1
- Document ID: US20250096904A1
- Status: Published application
- Kind: A1
- Application number: 18/962,715
- Filed: 2024-11-27
- Published: 2025-03-20
- Earliest claimed: 2022-08-10
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Junya NISHIOKA; Yoshiaki KONISHI; Seiki NAKAMURA; Takatoshi AKAMATSU
- Web page: https://patentgrep.com/patent/US20250096904A1

## CPC

- H04B 10/541: {Digital intensity or amplitude modulation}
- G02F 1/01: for the control of the intensity, phase, polarisation or colour (G02F1/29, G02F1/35 take precedence)
- G02F 1/21: by interference
- H04B 10/079: using measurements of the data signal
- H04B 10/508: Pulse generation, e.g. generation of solitons
- H04B: TRANSMISSION
- 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

A device includes: a light distributor to split a pulsed beam; a light sensor to convert a first pulsed beam split by the light distributor into an electric signal; an ADC to convert the electric signal obtained by the light sensor, which is an analog signal, into a digital signal; a correction superimposition waveform calculation unit to calculate correction superimposition waveform data which is waveform data to correct a distortion due to a temporal intensity fluctuation of a pulsed beam on the basis of superimposition waveform data and the electric signal; a DAC to convert the correction superimposition waveform data calculated by the correction superimposition waveform calculation unit, which is a digital signal, into an analog signal; and a light intensity modulator to obtain an intensity-modulated beam by superimposing the correction superimposition waveform data obtained by the DAC onto a second pulsed beam split by the light distributor.

## Claims

### Claim 1

A light intensity modulation device comprising:
a light distributor to split a pulsed beam;
a light sensor to convert a first pulsed beam split by the light distributor into an electric signal;
an analog-to-digital converter to convert the electric signal resulting from conversion by the light sensor, which is an analog signal, into a digital signal;
a correction superimposition waveform calculator to calculate correction superimposition waveform data which is waveform data representing any light intensity waveform, taking into consideration a distortion due to a temporal intensity fluctuation of a pulsed beam, on a basis of any superimposition waveform data and the electric signal resulting from conversion by the analog-to-digital converter, so that a value of the electric signal equivalent to a minimum value of the electric signal in a zone of the electric signal equivalent to a zone of the pulsed beam in which there is a possibility that a temporal intensity fluctuation has been generated in the pulsed beam, or an average value of a value of the electric signal equivalent to the minimum value becomes an upper limit value in a full-scale range of an intensity-modulated beam;
a digital-to-analog converter to convert the correction superimposition waveform data calculated by the correction superimposition waveform calculator, which is a digital signal, into an analog signal; and
a light intensity modulator to obtain an intensity-modulated beam having any waveform, by superimposing the correction superimposition waveform data resulting from conversion by the digital-to-analog converter onto a second pulsed beam split by the light distributor.

### Claim 2 (depends on 1)

The light intensity modulation device according to claim 1, wherein the correction superimposition waveform calculator calculates the correction superimposition waveform data on a basis of modulation characteristics of the light intensity modulator.

### Claim 3 (depends on 1)

The light intensity modulation device according to claim 1, wherein
the correction superimposition waveform calculator has:
a data gate acquirer to acquire data of a partial zone from the electric signal resulting from conversion by the analog-to-digital converter;
a minimum value sensor to sense a minimum value of the data acquired by the data gate acquirer; and
a waveform calculator to calculate the correction superimposition waveform data on a basis of the superimposition waveform data, the data acquired by the data gate acquirer, and the minimum value of the data sensed by the minimum value sensor.

### Claim 4 (depends on 3)

The light intensity modulation device according to claim 3, wherein the data gate acquirer performs data acquisition every time an electric signal is converted by the analog-to-digital converter.

### Claim 5 (depends on 3)

The light intensity modulation device according to claim 3, wherein the data gate acquirer performs data acquisition once or at a predetermined timing.

### Claim 6 (depends on 3)

The intensity modulation device according to claim 3, wherein the waveform calculator calculates the correction superimposition waveform data on a basis of a result obtained by averaging a plurality of pieces of data acquired by the data gate acquirer and a result obtained by averaging minimum values of the plurality of pieces of data sensed by the minimum value sensor, and the superimposition waveform data.

### Claim 7

A waveform compression device comprising:
a light distributor to split a pulsed beam;
a light sensor to convert a first pulsed beam split by the light distributor into an electric signal;
an analog-to-digital converter to convert the electric signal resulting from conversion by the light sensor, which is an analog signal, into a digital signal;
a correction superimposition waveform calculator to calculate correction superimposition waveform data which is waveform data representing any light intensity waveform, taking into consideration a distortion due to a temporal intensity fluctuation of a pulsed beam, on a basis of any superimposition waveform data and the electric signal resulting from conversion by the analog-to-digital converter, so that a value of the electric signal equivalent to a minimum value of the electric signal in a zone of the electric signal equivalent to a zone of the pulsed beam in which there is a possibility that a temporal intensity fluctuation has been generated in the pulsed beam, or an average value of a value of the electric signal equivalent to the minimum value becomes an upper limit value in a full-scale range of an intensity-modulated beam;
a digital-to-analog converter to convert the correction superimposition waveform data calculated by the correction superimposition waveform calculator, which is a digital signal, into an analog signal;
a light intensity modulator to obtain an intensity-modulated beam having any waveform, by superimposing the correction superimposition waveform data resulting from conversion by the digital-to-analog converter onto a second pulsed beam split by the light distributor;
a pulsed beam compressor to obtain a compressed pulsed beam by compressing the intensity-modulated beam obtained by the light intensity modulator; and
a second light sensor to convert the compressed pulsed beam obtained by the pulsed beam compressor into an electric signal.