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System for controlling the chirp of an optical signal

a technology of optical signal and chirp, applied in non-linear optics, instruments, optics, etc., can solve problems such as reliability, speed, flexibility, power handling,

Inactive Publication Date: 2015-10-29
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent provides an apparatus for altering the chirp (the speed at which light pulses change their shape) of an input light. The apparatus includes a grating structure and an electro-optical block. The input light is dispersed multiple times by the grating structure and then passes through the electro-optical block multiple times. The voltage applied to the electro-optical block can alter the chirp of the output light. The technical effect of this invention is to provide a way to control the chirp of an input light, which can be useful in various applications such as optical communication systems.

Problems solved by technology

The present techniques have problems with reliability, speed, flexibility, and power handling.

Method used

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  • System for controlling the chirp of an optical signal
  • System for controlling the chirp of an optical signal
  • System for controlling the chirp of an optical signal

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0035]FIG. 3 is an illustration of a first embodiment a system 300 that produces a chirped pulse. The system 300 includes a light source 102 that produces a broadband pulsed input light 104. The system also includes an EO material 106. An example of a suitable EO material is MgO:LiNbO3. The refractive index (n2) of the EO material 106 can be changed by applying a voltage via electrodes 108. The EO material 106 includes grating structures 112 on the input face and the output face of the EO material 106. A first lens 302 may couple the light 104 into a first port of a circulator 304. Light that enters the first port of the circulator 304 exits via a second port of the circulator 304 and into a lens 306. The light exiting lens 306 is then coupled into a lens 308. The light exiting lens 308 then passes through a first grating structure 112a at an incident angle θi. The first grating structure diffracts the light such that light with different wavelengths reach the second grating structu...

second embodiment

[0041]FIG. 4 is an illustration of a second embodiment a system 400 that produces a chirped pulse. The system 400 is substantially similar to system 300. The system 400 includes a fiber coupled light source 402 that produces a broadband pulsed input light 104. The fiber coupled light source 402 is coupled to a first port of a fiber coupled circulator 404. Light that enters the first port of the circulator 404 exits via a second port of the fiber coupled circulator 404 and into a GRIN lens 406. The light exiting the GRIN lens 406 then enters a first optical block 408a. The first optical block 408a has a refractive index of n1. The first optical block 408a may be made out of silica or some other suitable optical material.

[0042]After passing through the first optical block 408a the light then strikes a first grating structure 112a at an incident angle θi. The first grating structure 112a is between the first optical block 408a and an EO material 106. The first grating structure 112a ma...

third embodiment

[0045]FIG. 5 is an illustration of a second embodiment, a system 500, which produces a chirped pulse. The system 500 is substantially similar to system 300. The system 500 includes a light source 102 that produces a broadband pulsed input light 104. The system 500 includes a first EO material 506a and a second EO material 506b. The EO materials 506a-b include grating structures 512a-d on the input and the output faces of the EO materials 506a-b. The light from the light source 102 is coupled by a first lens 302 into a second lens 508a

[0046]The light exiting lens 508a then passes through a first grating structure 512a at an incident angle θi. The first grating structure 512a diffracts the light which then passes through the first EO material 506a. After passing through the first EO material 506a the second grating structure 512b diffracts the light again. The second grating structure 512b is arranged such that light with different wavelengths exit the second grating structure 512b a...

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Abstract

An apparatus for altering a chirp of an input light comprising one or more grating structures and one or more electro-optical blocks. In which a voltage is applied to the one or more electro-optical blocks to alter a chirp of light exiting the apparatus.

Description

BACKGROUND[0001]1. Field of Art[0002]Aspects of this disclosure are related to systems for controlling the chirp of an optical signal.[0003]2. Description of the Related Art[0004]In the context of the present disclosure, “chirp” refers to the manner in which the optical frequency changes over time. Chirp may also refer to the manner in which the optical frequency changes over time within the period of an optical pulse. An alternative definition of chirp is the time dependence of the instantaneous frequency of an optical pulse.[0005]Several methods have been used in order to control the chirp of a pulse including: optical fibers, grating pairs, prism pairs, chirp mirrors, and chirped fiber Bragg gratings. For example, prior art methods have adjusted the chirp of a pulse by changing the distance between a pair of gratings or a pair of prisms.[0006]There are several optical techniques in which the chirp of an optical pulse is an important parameter. When the chirp of the optical pulse ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/35
CPCG02F2203/25G02F1/353G02F1/035G02F2201/305
Inventor OTA, TAKEFUMI
Owner CANON KK