Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for optimizing polarization dependent loss

A technology of polarization dependent loss and axis direction, applied in the field of optical communication, can solve the problem of polarization dependent loss of optical filter

Active Publication Date: 2020-11-27
上海中科创欣通讯设备有限公司 +2
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the polarization-dependent loss of any interface is not too large, on the order of 0.01dB, but there are multiple interfaces in an optical passive device, and the polarization-dependent loss of these interfaces is superimposed, and it will reach a non-negligible order of magnitude
In addition, the optical fiber at the input end and the optical fiber at the reflective end are different fibers. In order to couple the input light to the optical fiber at the reflective end, the input light band of the filter is required to be incident at an angle. Usually this angle is about 2°, and the surface of the filter will also produce polarization dependent loss

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
  • Method for optimizing polarization dependent loss
  • Method for optimizing polarization dependent loss
  • Method for optimizing polarization dependent loss

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Example figure 1 As shown, the method for optimizing polarization-dependent loss in the present invention firstly establishes x-axis, y-axis, and z-axis coordinate system, wherein the x-axis and z-axis are parallel to the paper, the y-axis is perpendicular to the outside of the paper, and the input light 103 is in the optical fiber at the input end 101 propagates along the z-axis direction, and becomes incident light 301 with a small angle after passing through the first lens 20. The incident light 301 is reflected by the filter 30 and becomes reflected light 302, which propagates along the -z-axis direction and passes through the first lens 20. A lens 20 is injected into the optical fiber 102 at the reflective end; the incident light 301 passes through the optical filter 30 and becomes transmitted light 401 and continues to propagate along the z-axis direction, and enters the optical fiber 501 at the transmissive end after passing through the second lens 40; wherein, T...

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 invention discloses a method for optimizing polarization dependent loss. According to the method, the double-optical-fiber connecting line direction of a reflection end and an inclined plane direction are arranged in the same plane in an optical filter type passive device, the inclined plane direction of the reflection end and the inclined plane direction of a transmission end are mutually orthogonal, meanwhile, inclined plane angles of the reflection end and the transmission end are reduced, and the focal length of a lens is increased so as to reduce the incident angle of an optical filter. The method is used for reducing the polarization dependent loss index of the optical filter type passive device and meeting the requirement of precision application.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method for optimizing polarization-dependent loss. Background technique [0002] In the field of optical communication and sensing technology, the polarization-dependent loss (PDL) of optical passive devices is a very important index, which is used to measure the polarization sensitivity of optical devices. PDL is defined as the ratio of the maximum power to the minimum power after different polarization states pass through the device under test, expressed in logarithmic form. In practical applications, since the polarization state of the optical signal often changes randomly, this requires the polarization sensitivity of the device to be small enough, otherwise it will directly affect the use. The typical value of polarization-dependent loss of optical passive devices is generally 0.1dB. [0003] There are many mechanisms for generating polarization-dependent l...

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): G02B6/27G02B6/293
CPCG02B6/2793G02B6/29397
Inventor 洪亮张笃峰曹迎春
Owner 上海中科创欣通讯设备有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com