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High power multi-chip pump modules with protection filter for 1060nm, and pump modules including the same

A multi-chip, optical filter technology, applied in the field of optical filters, can solve problems such as distortion

Inactive Publication Date: 2012-07-11
OCLARO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this protection scheme is the distortion caused by the light reflected from the pump module in the fiber laser or amplifier

Method used

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  • High power multi-chip pump modules with protection filter for 1060nm, and pump modules including the same
  • High power multi-chip pump modules with protection filter for 1060nm, and pump modules including the same
  • High power multi-chip pump modules with protection filter for 1060nm, and pump modules including the same

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Experimental program
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Embodiment Construction

[0014] The pump module according to the invention uses one or more filters which reflect the pump light for coupling into the fiber pigtail while transmitting light of wavelengths greater than 1000 nm entering the module from the fiber. In this way, the light entering the module cannot reach the chip and cause any damage.

[0015] refer to figure 1 , shows a multi-chip pumping module according to an embodiment of the present invention. The module comprises a plurality of laser diodes 1, for example GaAs laser diodes, for providing suitable pumping power. In the example embodiment, the multi-chip pump module includes three laser diodes 1 , but the module may incorporate any different number of laser diodes (or other types of light sources) without departing from the scope of the present invention.

[0016] Each laser diode 1 emits light having a wavelength in a wavelength band of 750 nm to 1000 nm, more preferably, for example, a wavelength band of 915 nm to 980 nm. The ligh...

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Abstract

A multi-chip pump unit comprising a light source and a filter for directing light from the light source towards an optical fiber, wherein the filter exhibits one of either (i) relatively low transmissivity and high reflectivity at a wavelength of the light source, and relatively high transmissivity and low reflectivity at a wavelength greater than the wavelength of the light source; or (ii) relatively high transmissivity and low reflectivity at a wavelength of the light source, and relatively low transmissivity and high reflectivity at a wavelength greater than the wavelength of the light source.

Description

[0001] This application claims priority to US Provisional Application No. 61 / 145625, filed January 19, 2009, the entire contents of which are hereby expressly incorporated by reference. technical field [0002] The present invention relates to high power pump modules for pumping fiber lasers, and more particularly to filters for use therein. Background technique [0003] High power pump modules are used to pump fiber lasers. The pump wavelength is 910-980nm, while the fiber laser / amplifier wavelength is greater than 1000nm. Without isolation, some of the light from the fiber laser traveling in the backward direction could enter the pump module, causing damage to the semiconductor chip. [0004] To prevent this damage, some companies apply coatings to the fiber ends in front of the chip (lens fibers), or where appropriate both to the focusing optics between the chip and the fiber ends, and to the fiber ends themselves. This coating transmits pump light at 900-1000 nm and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/094H01S3/0941
CPCH01S3/09415H01S5/4012H01S5/4025H01S3/094003
Inventor B.瓦尔克
Owner OCLARO TECH