Abstract: This application provides a wavelength-division multiplexing device and a communications device. The wavelength-division multiplexing 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.

Abstract: A portable listening device comprising: a device housing defining an internal cavity; an acoustic port formed through the device housing; an audio driver disposed within the device housing and aligned to emit sound through the acoustic port; a multifunction input button coupled to the device housing, the multifunction input button having a distal end and a proximate end, a centerline between the distal and proximate ends and an axis of rotation located between the center line and the proximate end; an electronic circuit disposed within the device housing that requires power to operate and is configured to detect activation of the button; and a battery disposed within the device housing and operable to provide power to the electronic circuit.

Abstract: A portable listening device comprising: a device housing defining an internal cavity; an acoustic port formed through the device housing; an audio driver disposed within the device housing and aligned to emit sound through the acoustic port; a multifunction input button coupled to the device housing, the multifunction input button having a distal end and a proximate end, a centerline between the distal and proximate ends and an axis of rotation located between the center line and the proximate end; an electronic circuit disposed within the device housing that requires power to operate and is configured to detect activation of the button; and a battery disposed within the device housing and operable to provide power to the electronic circuit.

Abstract: A housing for packaging an optical transmitter module includes a body, a focusing structure, a first three-dimensional (3D) optical waveguide, and an optical fiber interface. The optical fiber interface is located inside the body and configured to accommodate a single-mode optical fiber. The first 3D optical waveguide is embedded in the body. The focusing structure is configured to receive a first single-mode optical signal and enable the received first single-mode optical signal to be focused for a first time at a focal point of the focusing structure. The first 3D optical waveguide is configured to receive the first single-mode optical signal, and output the first single-mode optical signal to the single-mode optical fiber. The focal point of the focusing structure coincides with an input end of the first 3D optical waveguide.

Abstract: A housing for packaging an optical transmitter module includes a body, a focusing structure, a first three-dimensional (3D) optical waveguide, and an optical fiber interface. The optical fiber interface is located inside the body and configured to accommodate a single-mode optical fiber. The first 3D optical waveguide is embedded in the body. The focusing structure is configured to receive a first single-mode optical signal and enable the received first single-mode optical signal to be focused for a first time at a focal point of the focusing structure. The first 3D optical waveguide is configured to receive the first single-mode optical signal, and output the first single-mode optical signal to the single-mode optical fiber. The focal point of the focusing structure coincides with an input end of the first 3D optical waveguide.