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Ultra-narrow bandpass filter

An optical filter and resonator technology, applied in the field of optical communication, can solve the problems of difficulty in manufacturing, expensive, heavy, etc., and achieve the effect of suppressing waveguide loss and improving optical power throughput

Inactive Publication Date: 2011-08-24
LUCENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Optical bandpass filters constructed from waveguide grating routers, while providing useful narrow bandpass characteristics, are somewhat bulky, difficult to manufacture and thus expensive

Method used

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Examples

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Embodiment Construction

[0013] The following merely illustrates the principles of the invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements which, although not explicitly described or shown here, embody the principles of the invention and are included within its spirit and scope.

[0014] Furthermore, all examples and conditional language recited herein are expressly intended primarily for pedagogical purposes only to assist the reader in understanding the principles of the invention and the concepts contributed by the inventors to advance the art, and are not to be construed as limiting such The specific described examples and conditions.

[0015] Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equiva...

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Abstract

A passband filter exhibiting ultra-narrow characteristics, comprising a cascaded pair of Mach-Zehnder (MZ) optical waveguide structures (370,380) each including a plurality of resonators (330,360) optically coupled to each of the amis of the MZ structures.

Description

technical field [0001] The present invention relates generally to the field of optical communications and in particular to narrowband bandpass optical filters exhibiting improved characteristics. Background technique [0002] Optical bandpass filters that transmit specific wavelength bands of light have found wide application in many optical systems. [0003] Optical bandpass filters constructed from waveguide grating routers, while providing useful narrow bandpass characteristics, are somewhat bulky, difficult to manufacture and therefore expensive. [0004] Optical bandpass filters constructed from allpass filters and Mach-Zehnder structures are often too sensitive to waveguide losses. Contents of the invention [0005] According to the principles of the present invention, an ultra-narrow bandpass filter is constructed from a two-stage allpass filter arrangement with a Mach-Zehnder structure. More specifically, two pole / zero filters are cascaded such that the desired r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/293
CPCG02B6/29343G02B6/29353G02B6/12007G02B6/2938G02B6/29355G02B6/26G02B6/293
Inventor M·拉斯拉斯
Owner LUCENT TECH INC