An optical cross apparatus including a single-row fiber array, and a single-row input multidimensional output optical waveguide element, where the single-row fiber array is coupled to the single-row input multidimensional output optical waveguide element, and an arbitrarily curved spatial three-dimensional waveguide is generated inside the single-row input multidimensional output optical waveguide element, and where a coupling surface of the single-row fiber array is the same as that of the single-row input multidimensional output optical waveguide element.

A wavelength division multiplexing device includes an alignment substrate configured to provide alignment between optical components of the device. The device includes a plurality of collimating lenses, and the alignment substrate includes a plurality of aligners. Each of the aligners is configured to place a respective one of collimating lenses in a predetermined position and a predetermined orientation with respect to the other collimating lenses. The alignment substrate thereby provides passive alignment of the collimating lenses with a designed optical path. The substrate may also include visual alignment markings that provide an indication of the placement of multi-layer thin film filters so that the filters define an actual optical path in alignment with the designed optical path, and integrated optical waveguides that provide an optical beam to each of the collimating lenses.

A photonic integrated circuit comprises an optical deinterleaver, including an input region, a dispersive region, and at least two output regions. The input region is adapted to receive an input optical signal including a plurality of channels. The dispersive region is optically coupled to the input region to receive the input optical signal. The dispersive region includes an inhomogeneous arrangement of a first material and a second material to structure the dispersive region to separate the input optical signal into a plurality of multi-channel optical signals, including a first multi-channel optical signal and a second multi-channel optical signal. The at least two output regions, include a first out region and a second output region optically coupled to the dispersive region. The first output region is positioned to receive the first multi-channel optical signal and the second output region is positioned to receive the second multi-channel optical signal.

Described herein is a system for directing light over two dimensions. In a first embodiment, an optical beam director includes a wavelength router, such as an optical interleaver, optically coupled to an array of dispersive elements, such as free-space diffractive couplers. In a second embodiment, an optical beam director includes a diffractive element optically coupled to a 1D-to-2D spatial interleaver.

A wavelength demultiplexing device configured so as to spatially distributing the spectral contributions of an incident light beam, when in use, and which includes a linear waveguide and a planar waveguide, formed in a coplanar way and adapted to be optically coupled with one another along a coupling line, by evanescent coupling. Such a device may further include diffraction gratings located in the planar waveguide, to extract light out of the latter.

Described herein is a system for directing light over two dimensions. In a first embodiment, an optical beam director includes a wavelength router, such as an optical interleaver, optically coupled to an array of dispersive elements, such as free-space diffractive couplers. In a second embodiment, an optical beam director includes a diffractive element optically coupled to a 1D-to-2D spatial interleaver.

A transmission device includes: a first wavelength conversion circuit configured to convert a wavelength band of a wavelength multiplexed signal light based on a wavelength of a second excitation light by performing four-wave mixing on the second excitation light and the wavelength multiplexed signal light inputted to a second nonlinear medium; and a second wavelength conversion circuit configured to convert the wavelength band of the wavelength multiplexed signal light based on a difference between frequencies of a third excitation light and a fourth excitation light by performing four-wave mixing on the third excitation light and the fourth excitation light and the wavelength multiplexed signal light inputted to a third nonlinear medium.

A wavelength demultiplexing device configured so as to spatially distributing the spectral contributions of an incident light beam, when in use, and which includes a linear waveguide and a planar waveguide, formed in a coplanar way and adapted to be optically coupled with one another along a coupling line, by evanescent coupling. Such a device may further include diffraction gratings located in the planar waveguide, to extract light out of the latter.

A single-fiber bidirectional optical transceiver subassembly, related to technology of optical communications, including an optical transmitting subassembly, an optical receiving subassembly and an optical splitting and filtering unit. The optical transmitting subassembly is coupled with an optical input port of the optical splitting and filtering unit. The optical receiving subassembly is coupled with an optical output port of the optical splitting and filtering unit. A bidirectional port of the optical splitting and filtering unit is coupled with a single-mode fiber. Each optical element in the optical transmitting subassembly, the optical receiving subassembly, and the optical splitting and filtering unit is a spatial optical element. Single-fiber bidirectional transmission is implemented with small channel spacing, by improving the optical splitting and filtering unit.

A fiber optic interconnection assembly has a plurality of leaf components and a plurality of spine components. Each leaf component of the plurality of leaf components is connected to each spine component of the plurality of spine components. Each spine components of the plurality of spine components is connected to each leaf component of the plurality of leaf components. Wherein the connections for each leaf component to each of the spine components is at a different wavelength and the connections for each spine component to each of the leaf components is at a different wavelength.