Wavelength-division multiplexing device and communications device
A wavelength-division multiplexing device or a communications device may include a fastener, optical fibers, a filter, and a lens. The fastener is provided with an optical fiber positioning hole and a filter mounting groove, the filter mounting groove is disposed on a side of a tail end that is of the optical fiber positioning hole and that is away from an opening of the optical fiber positioning hole, and the filter mounting groove and the tail end of the optical fiber positioning hole are spaced apart. The optical fiber may be installed in the optical fiber positioning hole, the filter may be installed in the filter mounting groove, and the filter may transmissively transmit or reflect light rays emitted from the optical fiber.
1 . A wavelength-division multiplexing device comprising: a fastener, optical fibers, a filter, and a lens, wherein:
the fastener is provided with an optical fiber positioning hole and a filter mounting groove, the filter mounting groove is disposed on a side of a tail end of the optical fiber positioning hole and that is away from an opening of the optical fiber positioning hole, and the filter mounting groove and the tail end of the optical fiber positioning hole are spaced apart;
an optical fiber of the optical fibers is installed in the optical fiber positioning hole, the filter is installed in the filter mounting groove, and the filter is configured to transmit or reflect light rays emitted by the optical fiber;
the lens is disposed between the optical fiber and the filter, and the lens is configured to:
perform collimation processing on light rays emitted by the optical fiber, or
converge collimated light rays and then input the converged light rays into the optical fiber; and
a positioning step is disposed at the tail end of the optical fiber positioning hole, and the optical fiber is configured to abut against the positioning step.
2 . The wavelength-division multiplexing device according to claim 1 , wherein the fastener is further provided with a lens hole connected to the optical fiber positioning hole, the lens hole is disposed at the tail end of the optical fiber positioning hole, and the positioning step is formed between the lens hole and the optical fiber positioning hole.
3 . The wavelength-division multiplexing device according to claim 2 , wherein an end of the lens hole and that is away from the optical fiber positioning hole has an arc-shaped surface; and on a same optical path, the lens is formed between the arc-shaped surface and a groove wall of the filter mounting groove.
4 . The wavelength-division multiplexing device according to claim 3 , wherein the lens is a spherical lens.
5 . The wavelength-division multiplexing device according to claim 3 , wherein the lens is an aspheric lens.
6 . The wavelength-division multiplexing device according to claim 2 , wherein a hole diameter of the lens hole is smaller than a hole diameter of the optical fiber positioning hole to form the positioning step.
7 . The wavelength-division multiplexing device according to claim 1 , wherein the wavelength-division multiplexing device further comprises at least another filter such that the wavelength-division multiplexing device comprises a plurality of filters, the fastener is provided with at least another optical fiber positioning hole and at least another filter mounting groove such that the fastener is provided with a plurality of optical fiber positioning holes and a plurality of filter mounting grooves, and a difference between a quantity of the plurality of optical fiber positioning holes and a quantity of the plurality of filter mounting grooves is 1; and
one optical fiber of the optical fibers is installed in each of the plurality of optical fiber positioning holes, and one filter of the plurality of filters is installed in each of the plurality of filter mounting grooves.
8 . The wavelength-division multiplexing device according to claim 7 , wherein the fastener includes a hollow area, and the plurality of filter mounting grooves are separately disposed on two opposite side walls of the hollow area.
9 . The wavelength-division multiplexing device according to claim 8 , wherein one optical fiber of the optical fibers on the fastener is configured to serve as a common end of the wavelength-division multiplexing device, and another optical fiber of the optical fibers is configured to serve as a transmissive end of the wavelength-division multiplexing device; the common end is configured to:
input light rays with different wavelengths into the wavelength-division multiplexing device, or
emit light rays with different wavelengths from the wavelength-division multiplexing device; and
the transmissive end is configured to convey a light ray with a single wavelength.
10 . The wavelength-division multiplexing device according to claim 9 , wherein the plurality of filters are disposed in a one-to-one correspondence with a plurality of transmissive ends of the wavelength-division multiplexing device.
11 . The wavelength-division multiplexing device according to claim 10 , wherein the wavelength-division multiplexing device further comprises at least another fastener such that the wavelength-division multiplexing device comprises a plurality of fasteners; and for two adjacent fasteners of the plurality of fasteners, a light ray emitted from one fastener of the plurality of fasteners may enter the other fastener of the plurality of fasteners through the common end on the other fastener.
12 . The wavelength-division multiplexing device according to claim 1 , wherein the fastener is made of a material whose optical transmittance is greater than 80% for a wave band greater than or equal to 1250 nanometers but less than or equal to 1350 nanometers.
13 . The wavelength-division multiplexing device according to claim 1 , wherein the fastener forms an integral structure.
14 . The wavelength-division multiplexing device according to claim 1 , wherein the wavelength-division multiplexing device further comprises a housing, and the fastener, the optical fiber, and the filter are accommodated in a cavity of the housing; and
a body of the housing is provided with an optical fiber mounting hole, and the optical fiber extends through the optical fiber mounting hole to the outside of the housing.
15 . The wavelength-division multiplexing device according to claim 14 , wherein a sealing structure is disposed between the optical fiber and a wall of the optical fiber mounting hole, and the optical fiber is fastened onto the housing via the sealing structure.
16 . A communications device, comprising a light source, a detector, and the wavelength-division multiplexing device according to claim 1 , wherein the wavelength-division multiplexing device is configured to converge or separate light rays with different wavelengths that are emitted by the light source, and the detector is configured to restore signals modulated into the light rays.
17 . The wavelength-division multiplexing device according to claim 1 , wherein the wavelength-division multiplexing device is configured as a multiplexer to converge the light rays with different wavelengths received from a light source so that the light rays having the different wavelengths can be conveyed into the optical fiber.
18 . The wavelength-division multiplexing device according to claim 1 , wherein the wavelength-division multiplexing device is configured as a demultiplexer to separate the light rays, the light rays having different wavelengths.