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Mode converter

A converter, internal mode technology, applied in instruments, light guides, optics, etc., can solve the problems of complex and difficult photosensitive distribution

Inactive Publication Date: 2011-06-15
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this control is difficult, and doping the fiber to obtain a specific sensitivity profile is complicated.

Method used

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Embodiment Construction

[0042] The mode converter of the present invention includes spliced ​​fiber sections. The first two parts constitute input microlenses adapted to diverge and collimate the input optical signal. The next part constitutes a phase shifting region adapted to introduce an appropriate phase shift to modify the lateral distribution of the intensity in order to convert the propagation mode of the input signal into another propagation mode. The next two parts constitute the output microlens adapted to focus the output signal into a suitable waveguide.

[0043] Since the fiber sections are spliced ​​together, the converter is compact and losses are minimized compared to free space solutions.

[0044] Fig. 1 is a schematic diagram of an optical transmission system including a mode converter of the present invention. The fiber optic signal may be a WDM signal, which is transmitted in a transmission fiber, for example, typically a single mode fiber. In this case, the fiber optic signal ...

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Abstract

An in-fiber mode converter comprises fiber portions constituting an input microlens, a fiber portion constituting a phase shifting region adapted to convert a propagation mode of an optical signal into another propagation mode, and fiber portions (30) constituting an output microlens. The said input and output microlens-constituting fiber portions are spliced, the converter is compact, and lossesare minimized relative to mode conversion in free space.

Description

technical field [0001] The present invention relates to optical mode conversion in optical fibers. Background technique [0002] A conventional optical fiber consists of a fiber core, which has the function of transmitting and, where appropriate, amplifying the light signal, and is surrounded by a fiber cladding, which has the function of confining the light signal within the core. For this, the refractive index n of the core 1 be greater than the refractive index n of the fiber cladding 2 . [0003] A graph that plots the refractive index against fiber radius is often referred to as a refractive index profile. By convention, the distance r to the center of the fiber is plotted along the abscissa axis and the difference between the refractive index of the fiber core and the fiber cladding is plotted along the ordinate axis. The expressions "step", "trapezoid" and "triangle" are used with respect to figures having the shape of a step, trapezoid and triangle, respectively....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/14
CPCG02B6/02261G02B6/14G02B6/02004G02B6/02023
Inventor C·德巴罗斯L·普罗沃斯特P·圣索内蒂P·尚克罗
Owner ALCATEL LUCENT SAS
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