Single-core bidirectional optical communication module and manufacturing method thereof

Abstract

The invention aims to provide a single-core bidirectional optical communication module (1), so as to achieve light output with high precision by adjusting an incident angle of lights that are emitted to a wavelength limiting filter (21) to be lower than an allowable error angle. An angle formed by the wavelength limiting filter (21) and an optical axis of a first lens (71) is adjusted by arranging the wavelength limiting filter (21) at a prescribed angle relative to a plane orthogonal to the optical axis of the first lens (71). In addition, the wavelength limiting filter (21) is adjusted around the optical axis of the first lens (71) by rotating the wavelength limiting filter (21) around the optical axis of the first lens (71). In this way, the incident angle of lights that are emitted to the wavelength limiting filter (21) is adjusted to be lower than an allowable error angle.

Description

technical field [0001] The invention relates to a single-core bidirectional optical communication module using one optical fiber to bidirectionally receive and receive optical signals and a manufacturing method thereof. Background technique [0002] With the increase of information traffic, in the field of optical communication systems, wavelength division multiplexing communication (WDM:Wavelength Division Multiplexing) as high-speed and large-capacity communication that transmits optical signals of multiple different wavelengths with one optical fiber has become popular, and further Increased capacity of communication traffic is promoted. [0003] Patent Document 1 discloses a single-core bidirectional optical communication module used for wavelength division multiplexing communication. It is an optical module optically coupled with an optical fiber. The optical fiber, light-emitting device, light-receiving device, wavelength division multiplexing filter and wavelength li...

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Problems solved by technology

[0016] In addition, in the prior art disclosed in Patent Document 1, the adjustment of the incident angle of the above-mentioned wavelength limiting filter is not performed, and the above-mentioned adjustment around the optical axis cannot be performed. Therefore, the desired reflection on the above-mentioned wavelength division multiplexing filter The above-mentioned light outside the wavelength band is received by the light-receiving device through the above-mentioned wavelength limiting filter

[0017] Therefore, in the prior art disclosed in Patent Document 1, there is a problem that the above-mentioned light outside the desired wavelength band is received by the light-receiving device and becomes noise, and high-precision signal output cannot be obtained.

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