Provided here are: a mounting section having a light-emitting element for emitting an optical signal; a mounting section arranged alongside the mounting section and having a light-emitting element for emitting an optical signal that is different in wavelength from the optical signal; and an optical multiplexer having a filter for transmitting therethrough only the wavelength of the optical signal, a mirror for reflecting the optical signal transmitted through the filter, and a filter arranged alongside the filter, for transmitting therethrough only the wavelength of the optical signal, and for reflecting the optical signal reflected by the mirror and multiplexing it with the transmitted optical signal; wherein the light-emitting element is mounted in the mounting section to be displaced toward the light-emitting element from a center in a width direction across an emission direction of the optical signal.

A method of assembling a wavelength division multiplexing (WDM) cassette for a fiber optic network is disclosed and includes attaching a first plurality of wavelength filters to a first cassette workpiece, attaching a second plurality of wavelength filters to a second cassette workpiece, organizing the optical fibers extending from the wavelength filters, adjusting a length of the optical fibers extending from wavelength filters, and forming an optical connection between the optical fibers from the wavelength filters via a mass fusion splice. The first cassette workpiece and the second cassette workpiece are separate from each during at least one of the attaching, organizing, adjusting, and forming steps. The optical fibers may have predetermined lengths for being arranged in a helix configuration and folded to produce an organized fiber stack that fits within the confines of the cassette. A WDM cassette having an organized arrangement of optical fibers is also disclosed.

Optical wavelength division multiplexing (WDM) devices include an optical chip having a number of waveguides therein, with a common optical fiber and single wavelength channel optical fibers optically coupled to the waveguides. Wavelength sensitive filters are disposed between the chip and the fibers, or across waveguides within the chip to reflect light at certain wavelengths and to transmit light at other wavelengths. In sonic embodiments, all of the fibers are located at the same end of the chip, in others the common fiber is located at one side of the chip and the single channel fibers located at another side, while in others the common fiber is located at a first side of the chip and the single channel fibers are located either at the first side of the chip or at a second side of the chip.

An optical transceiver including an optical transmitter and an optical receiver for performing a bi-directional communication over a single optical transmission fiber is provided. The optical transmitter includes a laser diode, a main body in which a receptacle part corresponding to an optical connector is formed, the optical connector to which a first optical fiber is coupled using a first supporting member, a second supporting member for supporting a portion coupled between the receptacle part and the optical connector, a plane-spring part provided in at least one of the main body and the optical connector. The optical connector has been coupled to the receptacle part. The plane-spring part is configured to provide an elasticity in a first direction to prevent an additional coupling toward the main body, the first direction is opposite toward the main body. The first optical fiber is connected to the optical receiver.

A system includes an optical fiber assembly, a receiver and a telescope, the receiver being positioned at a receiving end of the optical fiber assembly, the telescope being positioned at a collecting end, the receiver being arranged to receive uplink modulated light signals collected by the telescope and travelling through the optical fiber assembly, the telescope comprising an optical concentrator having an inlet face and an outlet face with a surface area smaller than that of the inlet face, the telescope further including a gradient-index lens dispose d coaxially with respect to the optical concentrator so that an inlet face of the gradient-index lens extends opposite the outlet face of the optical concentrator, the collecting end of the optical fiber assembly opening out opposite an outlet face of the gradient-index lens.

Example methods, devices, and systems for optical transmission are disclosed. An example method can comprise coupling a plurality of optical filters to a substrate. The method can comprise coupling a polymeric waveguide to the plurality of optical filters. The polymeric waveguide can be configured to guide a free space optical signal along the polymeric waveguide and communicate, via the plurality of optical filters, one or more components of the free optical space signal to an integrated chip.

A device includes a module comprising an arrayed waveguide grating (AWG), and a filter having a filter input port, a filter output port, and a filter COMM output port. The filter is operable such that a first range of wavelengths entering the filter at the filter input port is directed to the filter output port and a second range of wavelengths entering the filter at the filter input port is directed to the COMM output port. The AWG includes an AWG input port optically coupled to the filter output port to receive the first range of wavelengths, and a plurality of AWG output ports.

A fiber optic assembly is provided including a body defining a fiber routing volume, a plurality of fiber optic components disposed in a front side of the body, and a plurality of optical filters disposed within the volume. The plurality of optical filters enable at least twenty four (24) dense wavelength division multiplexing (DWDM) channels.

A fiber optic assembly is provided including a body defining a fiber routing volume, a plurality of fiber optic components disposed in a front side of the body, and a plurality of optical filters disposed within the volume. The plurality of optical filters enable at least twenty four (24) dense wavelength division multiplexing (DWDM) channels.

A fiber optic assembly is provided including a body defining a fiber routing volume, a plurality of fiber optic components disposed in a front side of the body, and a plurality of optical filters disposed within the volume. The plurality of optical filters enable at least twenty four (24) dense wavelength division multiplexing (DWDM) channels.