Wavelength selective reflector and optical module of optical network unit
A wavelength-selective, optical network unit technology, used in electrical components, electromagnetic wave transmission systems, transmission systems, etc., can solve problems such as high cost, difficulty in popularization, and inability to install, and achieves high precision, accuracy, and efficiency. Effect
Active Publication Date: 2016-12-07
CHINA TELECOM CORP LTD
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Problems solved by technology
There are several problems in the deployment and application of this reflector: 1. The cost of Fiber Bragg Grating FBG is relatively high, generally tens of yuan, and it is difficult to popularize in the short term; High job management and control requirements
It is generally difficult to guarantee 100% installation; 3. There are problems such as the need to change the structure of the flange / cold connector when installing the reflector on the flange or the cold connector, and the installation cannot be installed in the scene of fiber optic fusion splicing.
Existing ONU external reflectors are difficult to promote on a large scale due to the above problems
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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0029] The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
[0030] At the same time, it should be understood that, for the convenience of d...
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This invention discloses a wavelength selective reflector and an optical module of an optical network unit. The wavelength selective reflector comprises a first wavelength division multiplexing element, a second wavelength division multiplexing element and a first coupling element; the first wavelength division multiplexing element is used for reflecting a first optical signal reflected from a pigtail to the second wavelength division multiplexing element; the second wavelength division multiplexing element is used for reflecting the first optical signal to the first coupling element; and, the first coupling element is used for focusing the diverging first optical signal reflected from the second wavelength division multiplexing element into a parallel light, so that the first optical signal can be reflected back to the pigtail through the first wavelength division multiplexing element. Through focusing the diverging first optical signal reflected from the reflection element into the parallel light by the first coupling element, the efficiency for coupling the optical signal into the pigtail can be improved; thereby, the accuracy of OTDR (Optical Time Domain Reflectometry) test can be improved; and thus, the precision of the fault diagnosis of the ODN (Optical Distribution Node) link can be improved.
Description
technical field [0001] The invention relates to the field of telecommunication equipment, in particular to a wavelength selective reflector and an optical network unit optical module. Background technique [0002] OTDR (Optical Time Domain Reflector, Optical Time Domain Reflector) has become an essential tool for fault analysis and location of traditional optical fiber links, but in PON (Passive Optical Network, Passive Optical Network) ODN (Optical Distribution Network, Optical Distribution Network) network In the application of PON ODN, because PON ODN introduces a first-level or even second-level optical splitter, the optical pulse signal measured by OTDR on the distribution fiber and the home fiber is greatly attenuated. At the same time, under the point-to-multipoint ODN structure, the backscatter signal of the attenuation event on the faulty branch fiber will also be superimposed and interfered by the backscattering signals of other branch fibers, and finally the OTDR ...
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IPC IPC(8): H04B10/071
Inventor 杜喆汪国荣沈成彬蒋铭
Owner CHINA TELECOM CORP LTD