# US 11,307,351 B2 · Apparatus and method for shaping optical waveform

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- Number: US 11,307,351 B2
- Document ID: US11307351B2
- Status: Granted
- Kind: B2
- Application number: 16/704,931
- Filed: 2019-12-05
- Published: 2020-06-11
- Granted: 2022-04-19
- Earliest claimed: 2018-12-07
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Sang-Pil Han; Minhyup Song; Sungil Kim
- Web page: https://patentgrep.com/patent/US11307351B2

## CPC

- G02B 6/12019: {characterised by the optical interconnection to or from the AWG devices, e.g. integration or coupling with lasers or photodiodes (coupling integrated waveguide to fibre G02B6/30, to optoelectronic element G02B6/42; monolithic integration of integrated waveguides with other optical elements G02B6/12004)}
- G02B 6/356: {in an optical cross-connect device, e.g. routing and switching aspects of interconnecting different paths propagating different wavelengths to (re)configure the various input and output links (switching polarized beams G02B6/3594; power equalizers G02B6/356 and G02B6/3594; path selecting means H04Q11/0001)}
- G02B 27/123: {The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power}
- H04J 14/0307: {Multiplexers; Demultiplexers}
- H04Q 11/0005: {Switch and router aspects}
- G02B 2006/12102: {Lens}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W)

## Abstract

Provided are an optical waveform shaping apparatus and an optical waveform shaping method. According to an embodiment, the optical waveform shaping apparatus includes a multiplexer/demultiplexer (D/MUX) unit demultiplexing an optical signal in which optical signals of a plurality of wavelengths are multiplexed, a micro lens system refracting the demultiplexed optical signal into a collimated beam of light, and a wavelength level controller unit shaping a waveform of the optical signal. The wavelength level controller unit includes a 2D LCoS for adjusting and reflecting an amplitude or a phase value of the demultiplexed optical signal to have a distribution that is desired for each cell, and a controller for controlling the distribution.

## Claims

### Claim 1

An optical waveform shaping apparatus comprising:
a multiplexer/demultiplexer (D/MUX) unit to demultiplex an optical signal in which optical signals of a plurality of wavelengths are multiplexed;
a micro lens system to refract the demultiplexed optical signal into a collimated beam of light; and
a wavelength level controller unit to shape a waveform of the optical signal, and
wherein the wavelength level controller unit comprises a 2D LcoS (Liquid Crystal on Si) for adjusting an amplitude or a phase value of the demultiplexed optical signal to have a distribution that is desired for each cell and reflecting the adjusted optical signal, and a controller for controlling the distribution;
wherein the D/MUX unit includes:
a first D/MUX part to separate an optical multi-channel signal into a plurality of wavelength bands and to output the separated optical multi-channel signal; and
a second D/MUX part in which a plurality of D/MUXs respectively corresponding to the plurality of wavelength bands are stacked in layers in a same wafer, and
wherein each of the D/MUXs divides and outputs the optical multi-channel signal of each wavelength band for each wavelength.

### Claim 2 (depends on 1)

The optical waveform shaping apparatus of claim 1, wherein the micro lens system is attached to an output part of the D/MUX unit.

### Claim 3 (depends on 1)

The optical waveform shaping apparatus of claim 1, wherein the micro lens system is attached to an input part of the 2D LcoS.

### Claim 4 (depends on 1)

The optical waveform shaping apparatus of claim 1, wherein the micro lens system includes a 2D micro lens array.

### Claim 5 (depends on 1)

The optical waveform shaping apparatus of claim 1, wherein the D/MUXs constituting the second D/MUX part are formed through a photolithography process.

### Claim 6 (depends on 1)

The optical waveform shaping apparatus of claim 1, wherein the D/MUXs constituting the second D/MUX part are formed by irradiating high-power pulse laser to an optical waveguide type D/MUX.

### Claim 7 (depends on 4)

The optical waveform shaping apparatus of claim 4, wherein the 2D micro lens array is formed through a photolithography process.

### Claim 8 (depends on 4)

The optical waveform shaping apparatus of claim 4, wherein the 2D micro lens array is formed through a hot embossing process.

### Claim 9 (depends on 4)

The optical waveform shaping apparatus of claim 4, wherein the 2D micro lens array is formed through a nano-imprint process.