Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical module with optical filter

A technology of optical modules and optical filters, which is applied to the coupling of optics, optical components, and optical waveguides, and can solve problems such as increased losses

Inactive Publication Date: 2008-07-30
RESONAC CORPORATION
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the loss of light of wavelengths whose emission positions do not match increases, causing problems in multi-path propagation of light.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical module with optical filter
  • Optical module with optical filter
  • Optical module with optical filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] As described above, the present invention is made by paying attention to the group delay of the optical filter. The group delay of a filter is the time during which propagating light is additionally turned off in the filter. FIG. 1 is a graph showing an example of the relationship between the transmittance of an optical filter with respect to an optical wavelength and the group delay GD. As shown in Figure 1, the group delay GD of a filter can be calculated by differentiating the propagation constant with the angular frequency and multiplying it by the propagation distance. For example, in FIG. 1 , when the abscissa indicates wavelength, it can be seen from FIG. 1 that group delay occurs in accordance with the degree of change in the transmittance of the filter.

[0027]Hereinafter, an optical module according to the present invention will be described with reference to the drawings. Fig. 2 is a schematic diagram showing an optical module according to the present inve...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The optical module (1) of the present invention has: an optical filter (6) having an incident surface (2) and an outgoing surface (4); an incident side core (8) connected to the incident surface (2); The exit side core (10) on the face (4). Let light of a predetermined wavelength incident from the incident position (14) propagate according to Snell's law and exit from the exit surface (4) as the Snell exit position (20). In the equivalent filter (6"), the exit position (16) is separated from the Snell exit position (20) by a group delay-related distance (D) in a direction away from the incident position (14).

Description

technical field [0001] The invention relates to an optical module with a filter. Background technique [0002] WDM (wavelength division multiplexing, wavelength division multiplexing) transmission, which transmits light of multiple wavelengths in one optical fiber, is attracting attention as a solution to disseminate large-capacity information faster, and various systems and optical modules related to it are being developed. development and productization. Regarding optical modules for WDM transmission, attention is being paid to optical multiplexers and demultiplexers using optical waveguides that can be integrated and miniaturized. The structure of multiplexing and demultiplexing waves. As explained in the WDM propagation optical module, it is conventionally known to use a multilayer film in which a plurality of high-refractive-index layers and low-refractive-index layers made of inorganic substances are laminated together as optical filters (thin-film filters). optical...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293G02B6/26
CPCG02B5/285G02B6/29361G02B6/29371G02B6/29373G02B6/29389G02B6/29394
Inventor 山本礼宫寺信生黑田敏裕
Owner RESONAC CORPORATION