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Multi-port coupler, optical amplifier, and fiber laser

A coupler, multi-port technology, used in the coupling of lasers, laser components, optical waveguides, etc., can solve problems such as difficulty in reducing connection loss, and achieve the effect of long life and elimination of failures

Inactive Publication Date: 2007-12-05
THE FUJIKURA CABLE WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Considering the above situation, it can be seen that it is practically difficult to reduce the connection loss generated at the connection part of the multi-port coupler

Method used

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  • Multi-port coupler, optical amplifier, and fiber laser
  • Multi-port coupler, optical amplifier, and fiber laser
  • Multi-port coupler, optical amplifier, and fiber laser

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Embodiment

[0083] In an optical amplifier with an excitation wavelength of 915nm and a signal wavelength of 1064nm, the multiport coupler of the present invention (the multiport coupler shown in Figure 3) was applied, and the effect of LD failure suppression was studied.

[0084] A Yb-doped double-clad fiber was used as the cladding pump fiber.

[0085] The dimensions of the optical fiber at this time are as follows.

[0086] • Fiber core diameter: 20 μm, • Core-inner cladding relative refractive index difference Δ: 0.1%, • Inner cladding outer diameter: 400 μm.

[0087] In addition, 6 LDs with a wavelength of 915 nm and an output of 5 W were used for the LD used for excitation.

[0088] In addition, the excitation optical fiber connected to the excitation LD had a core diameter: 105 μm, and a core-cladding relative refractive index difference Δ: 0.55%.

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Abstract

A multi-port coupler for coupling an pumping light source to a cladding pump fiber for optical amplification, includes a central signal fiber and a plurality of pumping fibers arranged around the central signal fiber, the central signal fiber and the plurality of pumping fibers being unified and a front side is reduced in diameter, wherein an emitted light confining waveguide part is provided around a core of the signal fiber located at the center, and the emitted light confining waveguide part whose outer diameter is larger than that of the core has a higher refractive index than a cladding and a lower refractive index than the core and the emitted light confining waveguide part is formed continuously from a splicing point of the cladding pump fiber to a coupler front end branched into multiple fibers.

Description

technical field [0001] The present invention relates to an optical fiber amplifier used in optical communication, especially a short-distance transmission system or a multi-port coupler used in a fiber laser, and an optical amplifier and a fiber laser using the same. [0002] This application claims priority to Japanese Patent Application No. 2006-149696 filed on May 30, 2006 and Japanese Patent Application No. 2006-260881 filed on September 26, 2006, the contents of which are incorporated herein. Background technique [0003] In high-output optical amplifiers, fiber lasers, and the like, a clad-pump structure is generally used. It is a device that provides a structure for propagating the excitation light necessary to amplify the light propagating through the core of the optical fiber through the cladding. At the same time that this cladding-pumped structure is widely used, a high-power laser diode (hereinafter, referred to as LD) output from a multimode fiber is used. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/42G02F1/35G02F1/39H01S3/00
Inventor 中居道弘酒井哲弥
Owner THE FUJIKURA CABLE WORKS LTD
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