Optical multiplexer/demultiplexer and production method for optical multiplexer/demultiplexer

Abstract

In the field of optical communication, the present invention is an optical multiplexer / demultiplexer capable of demultiplexing multiplexed optical signals of multiple wavelength regions into each wavelength region, or combining the light of each wavelength region. That is, the optical multiplexed light of wavelength λ1, λ2, λ3, λ4 is emitted from the optical fiber (9a), and its optical axis is bent by the microlens (12a) of the microlens array (14) to become parallel light, by Reflected by the plane mirror layer (19), it is incident to the filter layer (17). The filter (17a) only transmits light of wavelength λ1, so light of other wavelengths is reflected, reflected by the plane mirror layer (19) again, and enters the filter layer (17). The light transmitted through the filter (17a) is bent by the microlens (12c) to combine with the optical fiber (9c). Lights of wavelengths λ1, λ2, λ3, and λ4 are taken out from the light output ends of the optical fibers (9c, 9d, 9e, 9f), respectively.

Description

technical field [0001] The invention relates to a multi-channel, small-sized optical multiplexer and a manufacturing method of the optical multiplexer. Background technique [0002] In recent years, optical communication using optical fiber as a signal transmission medium has spread to the extent that it can be used in various households. A communication network using a wavelength multiplexing transmission method in which optical signals with different wavelengths are multiplexed and transmitted using a single optical fiber is constantly evolving. Along with this, it is desired to multiplex a plurality of lights with different wavelengths, or to downsize an optical multiplexer / demultiplexer for demultiplexing the wavelength-multiplexed light for each wavelength, and to mass-produce it at low cost. [0003] figure 1 It is a schematic side view showing the structure of an optical demultiplexer 1 of a conventional example (refer to Japanese Unexamined Patent Publication No. S...

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Problems solved by technology

[0005] But when figure 1 In the shown light splitter 1, it is necessary to make the light emitted from the collimator 3a obliquely incident on the surface 6a of the glass body 6, the more the number of wavelengths (or the number of optical fibers) for demultiplexing increases, from the collimator 3a to The longer the distance between the surfaces 6a of the glass body, the larger the optical splitter 1 is.

In addition, determine the installation positions of the collimator 3a-3e and the glass body 6, or paste a plurality of interference film filters 5a-5d on the glass body 6 with high precision, or form a reflector on the glass body 6 with high precision The manufacturing steps of 7 are complicated, so it is impossible to improve production efficiency and it is difficult to reduce costs

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