Ultrafast optical switching device based on black phosphorus

Patent metadata

Field	Value
Publication number	US-9904144-B1
Application number	US-201715487583-A
Country	US
Kind code	B1
Filing date	Apr 14, 2017
Priority date	Nov 30, 2016
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Disclosed is an ultrafast optical switching device based on black phosphorus, including a first channel to generate a first laser which is a continuous wave of a first wavelength, a second channel to generate a second laser which is a continuous wave of a second wavelength different from the first wavelength, a modulator to modulate the second laser generated by the second channel into a pump signal, a first and a second wavelength tunable filters to change wavelengths of the first laser and the second laser, respectively, a directional coupler to couple the first laser and the second laser, and an optical element to control the first and second lasers coupled by the directional coupler by means of nonlinearity and an evanescent field of black phosphorus. Accordingly, volume and size of an ultrafast optical switching device may be reduced, and a data processing rate may be improved.

First claim

What is claimed is:

1. An ultrafast optical switching device based on black phosphorus, comprising:
a first channel configured to generate a first laser which is a continuous wave of a first wavelength;
a second channel configured to generate a second laser which is a continuous wave of a second wavelength different from the first wavelength;
a modulator configured to modulate the second laser generated by the second channel into a pump signal;
a first wavelength tunable filter and a second wavelength tunable filter configured to change wavelengths of the first laser and the second laser, respectively;
a directional coupler configured to couple the first laser and the second laser; and
an optical element configured to control the first and second lasers coupled by the directional coupler by means of nonlinearity and an evanescent field of black phosphorus.

2. The ultrafast optical switching device based on black phosphorus according to claim 1 , further comprising:
a first amplifier and a second amplifier configured to amplify wavelengths of the first laser and the second laser, respectively.

3. The ultrafast optical switching device based on black phosphorus according to claim 1 , further comprising:
a first polarization controller (PC) and a second polarization controller configured to adjust polarizations of the first laser and the second laser, respectively.

4. The ultrafast optical switching device based on black phosphorus according to claim 1 ,
wherein the optical element includes:
a core formed at a center of an optical fiber in a length direction thereof and allowing a laser to pass therethrough;
a cladding configured to surround the core, the cladding being partially removed so that the core is exposed in the length direction; and
a black phosphorus layer located on the core where the cladding is removed, the black phosphorus layer interacting with the laser to guide saturable absorption of the laser in the core.

5. The ultrafast optical switching device based on black phosphorus according to claim 4 , further comprising:
a protective layer formed on the black phosphorus layer to prevent oxidation of the black phosphorus layer.

6. The ultrafast optical switching device based on black phosphorus according to claim 4 ,
wherein the black phosphorus layer is formed with a single layer or multi layers.

7. An ultrafast optical switching device based on black phosphorus, comprising:
a first channel configured to generate a first laser which is a continuous wave of a first wavelength;
a second channel configured to generate a second laser which is a continuous wave of a second wavelength different from the first wavelength;
a modulator configured to modulate the second laser generated by the second channel into a pump signal;
a directional coupler configured to couple the first laser and the second laser;
a wavelength tunable filter configured to change a wavelength of the first and second lasers coupled to each other, respectively; and
an optical element configured to control the first and second lasers coupled by the directional coupler by means of nonlinearity and an evanescent field of black phosphorus.

8. The ultrafast optical switching device based on black phosphorus according to claim 7 , further comprising:
an amplifier configured to amplify a wavelength of the first laser and the second laser coupled to each other, respectively.

9. The ultrafast optical switching device based on black phosphorus according to claim 7 , further comprising:
a first polarization controller (PC) and a second polarization controller configured to adjust polarizations of the first laser and the second laser, respectively.

10. The ultrafast optical switching device based on black phosphorus according to claim 7 ,
wherein the optical element includes:
a core formed at a center of an optical fiber in a length direction thereof and allowing a laser to pass therethrough;
a cladding configured to surround the core, the cladding being partially removed so that the core is exposed in the length direction; and
a black phosphorus layer located on the core where the cladding is removed, the black phosphorus layer interacting with the laser to guide saturable absorption of the laser in the core.

11. The ultrafast optical switching device based on black phosphorus according to claim 10 , further comprising:
a protective layer formed on the black phosphorus layer to prevent oxidation of the black phosphorus layer.

12. The ultrafast optical switching device based on black phosphorus according to claim 10 ,
wherein the black phosphorus layer is formed with a single layer or multi layers.

Assignees

• Korea Inst Sci & Tech

Inventors

• Song Yong Won
• Uddin Md Siam

Classifications

• G02F1/355

  characterised by the materials used · CPC title

• G02F1/365

  in an optical waveguide structure (G02F1/377, {G02F1/395} take precedence) · CPC title

• G02F2203/07

  Polarisation dependent · CPC title

• G02F1/3536

  Four-wave interaction · CPC title

• G02F1/3521 Primary

  using a directional coupler · CPC title