Disclosed herein is wavelength-division multiplexing (WDM) and demultiplexing with signal entry and exit in a common routing surface to increase channel density. In particular, disclosed is a WDM assembly including a plurality of common ports and a plurality of channel sets having one or more channel ports. The WDM assembly includes a first routing surface with a first WDM passband and a second routing surface offset from the first routing surface. The second routing surface is configured to reflect at least one signal passed through the first routing surface back through the first routing surface at a laterally different location. Optical signal paths of at least a portion of the common ports are parallel to and offset from one another. In certain embodiments, such a configuration may increase channel density and decrease a form factor (e.g., footprint).

A high resolution, wide spectral range, optical apparatus that includes an optical resonator cavity and a wavelength demultiplexer, arrangeable in multiple configurations. A method for increasing the resolution of a wavelength demultiplexer involves inputting light into an optical resonant cavity; inputting a plurality of different resonant output wavelengths to a wavelength demultiplexer; and routing each different resonant wavelength to a different output waveguide of the demultiplexer to generate a demultiplexer output spectrum. The method further involves performing either a time serialization or a space serialization procedure to increase the channel density and fully cover the spectrum of interest.

An optical assembly includes a first grating device configured to: receive a light beam that includes an optical signal with a particular wavelength from a fiber; and change a propagation direction of the optical signal according to the particular wavelength of the optical signal. The optical assembly also includes a second grating device configured to: receive the optical signal outputted from the first grating device; change the propagation direction of the optical signal according to the particular wavelength of the optical signal; and direct the optical signal onto a grating coupler. The first grating device and the second grating device are configured to satisfy a plurality of configuration constraints.

Disclosed herein is wavelength-division multiplexing (WDM) and demultiplexing with signal entry and exit in a common routing surface to increase channel density. In particular, disclosed is a WDM assembly including a plurality of common ports and a plurality of channel sets having one or more channel ports. The WDM assembly includes a first routing surface with a first WDM passband and a second routing surface offset from the first routing surface. The second routing surface is configured to reflect at least one signal passed through the first routing surface back through the first routing surface at a laterally different location. Optical signal paths of at least a portion of the common ports are parallel to and offset from one another. In certain embodiments, such a configuration may increase channel density and decrease a form factor (e.g., footprint).

Methods and systems concerning demultiplexing and multiplexing light in optical multiplexing systems are disclosed herein. An optical multiplexing system may include a number of light emitters and a number of associated waveguides. Light emitted from each of the number of light emitters may travel through the associated waveguide and may enter a multiplexer, where a multiplexing operation may occur. At least one of the number of light emitters may be configured to emit light with multiple wavelengths. Such a light emitter may further be associated with a demultiplexer to demultiplex the light with multiple wavelengths before the light reaches a multiplexer. After a demultiplexing operation, the demultiplexed light may be directed to multiple waveguides and the multiple waveguides may guide the demultiplexed light to a multiplexer.

Methods and systems concerning demultiplexing and multiplexing light in optical multiplexing systems are disclosed herein. An optical multiplexing system may include a number of light emitters and a number of associated waveguides. Light emitted from each of the number of light emitters may travel through the associated waveguide and may enter a multiplexer, where a multiplexing operation may occur. At least one of the number of light emitters may be configured to emit light with multiple wavelengths. Such a light emitter may further be associated with a demultiplexer to demultiplex the light with multiple wavelengths before the light reaches a multiplexer. After a demultiplexing operation, the demultiplexed light may be directed to multiple waveguides and the multiple waveguides may guide the demultiplexed light to a multiplexer.

A waveguide tube includes a first waveguide block, a second waveguide block and a nano plating layer. The first waveguide block has a first combination surface. A middle of one side of the first combination surface is recessed inward to form a first waveguide recess. The second waveguide block is fastened with the first waveguide block. The second waveguide block has a second combination surface disposed corresponding to the first combination surface. A middle of one side of the second combination surface is recessed inward to form a second waveguide recess. The first combination surface and the second combination surface are attached with each other, so the first waveguide recess is combined with the second waveguide recess to form a waveguide space. The nano plating layer is plated on outer surfaces of the first waveguide block and the second waveguide block which are completed being assembled.

Multiplexer or demultiplexer module has a carrier plate with at least one wavelength-selective element, at least two focussing elements, a waveguide, preferably a fibre optic cable, for the transmission of an optical signal, which has a signal output or input for coupling the optical signal in or out and collimation optics, which are arranged between signal output and a first wavelength-selective element. In a demultiplexer module, forces transmitted via the waveguide to the demultiplexer module are diverted such that passive adjustment of the optical elements is hardly influenced. The demultiplexer module is connected to a detector plate, can be adjusted with respect to detectors located on a detector plate, and has a high thermal tolerance. The carrier plate has a stop for the waveguide preferably configured integrally with the carrier plate, wherein the waveguide or a coating surrounding the waveguide rests on or is fastened, preferably adhered to the stop.

An optical multiplexer/demultiplexer may include some beam splitters on the first surface, a first reflector on the first surface and between the beam splitters, and a second reflector on the second surface. Light propagates between the first surface and the second surface. The light transmission body has some first input/output sections on the first surface for inputting or outputting the respective signal beams. The light transmission body has a second input/output section on the second surface for inputting or outputting the multiplexed signal beam. Each of the beam splitters is placed at a corresponding one of the first input/output sections to pass a corresponding one of the signal beams. The first reflector stays away from any one of the first input/output sections.

Methods and systems concerning demultiplexing and multiplexing light in optical multiplexing systems are disclosed herein. An optical multiplexing system may include a number of light emitters and a number of associated waveguides. Light emitted from each of the number of light emitters may travel through the associated waveguide and may enter a multiplexer, where a multiplexing operation may occur. At least one of the number of light emitters may be configured to emit light with multiple wavelengths. Such a light emitter may further be associated with a demultiplexer to demultiplex the light with multiple wavelengths before the light reaches a multiplexer. After a demultiplexing operation, the demultiplexed light may be directed to multiple waveguides and the multiple waveguides may guide the demultiplexed light to a multiplexer.