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Optical transmission module

A technology of optical transmission and optical modules, applied in the direction of optics, optical components, light guides, etc., can solve the problem that the coupling efficiency cannot be guaranteed

Inactive Publication Date: 2005-12-21
日本ルメンタム株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, if the positional shift amount between the first semiconductor laser 1 and the first lens 2 is about several μm, even if the installation accuracy of the first lens 2 and the second lens 3 is made as high as possible, the coupling efficiency will be low. cannot be guaranteed

Method used

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Embodiment Construction

[0038] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0039] figure 1 It is a partial cutaway side view of the first embodiment of the optical transmission module of the present invention. The optical system of this embodiment includes: a semiconductor laser 1 , a first lens 2 , a second lens 3 and an optical fiber 4 . The second lens 3 is previously fixed to the module case 5 using a connecting material such as solder or low-melting glass. In this case, the connection of the second lens 3 and the module case 5 is such that the connection surface therebetween remains airtight. The airtightness inside the module box 5 is ensured in this way, so that the reliability of the module can be increased. As for the method of fixing the second lens 3, it is possible to manufacture a mold in which a lens formed together with the metal cylinder 9 is used, and the metal cylinder 9 and the module case are fixed in advance with...

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Abstract

A semiconductor laser and an optical fiber are optically coupled through a first lens and a second lens, the second lens is pre-fixed on a module box, and the above-mentioned components are all installed on the module box. When f1 and f2 are used to represent the focal length of the first lens and the focal length of the second lens, the main plane of the first lens on its second lens side and the main plane of the second lens on its first lens side The optical distance between them is substantially equal to f1+f2. Therefore, there is provided an optical transmission module capable of obtaining high coupling efficiency at low cost and high yield.

Description

technical field [0001] The present invention relates to an optical transmission module mainly used in an optical transmission system or an optical switching system (both are referred to as an optical transmission system). Background technique [0002] An optical coupling structure of an optical transmission module is like a known method shown in Japanese Patent Publication No. 178986 / 1997, etc., wherein the optical coupling system adopted utilizes two lenses to efficiently transmit a large emission angle beam from a semiconductor laser For a small NA (Numerical Aperture) fiber, i.e.: a first lens with a large NA is used to collimate the beam from the semiconductor laser, a second lens with a small NA is used to focus the collimated beam into the fiber one end. A conventional configuration system related to an optical coupling system employs a so-called active collimation system for emitting light from a light-emitting element such as a semiconductor laser, and then adjusts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/42H01S5/022
CPCG02B6/4204G02B6/4206G02B6/4225G02B6/4237
Inventor 松嶋直树川本和民刀祢平高一郎
Owner 日本ルメンタム株式会社