Techniques for reducing optical fiber bending loss in an optical transceiver are disclosed. In an embodiment, a small form-factor (SFF) optical transceiver housing includes a demultiplexer device, such as an arrayed waveguide grating (AWG) device, having a longitudinal center line that is offset laterally by a distance D.sub.offset from the longitudinal center line of the SFF optical transceiver housing. The lateral offset distance D.sub.offset may advantageously enable an intermediate optical fiber coupling the demultiplexer with an optical coupling receptacle, such as an LC connector, to be routed within the SFF optical transceiver housing in a manner that avoids introducing bends that are less than a minimum bending radius associated with the intermediate optical fiber cable. Thus some embodiments of the present disclosure enable greater tolerance when routing an intermediate optical fiber within housings that would otherwise introduce bending loss by virtue of their constrained dimensions.

A multi-channel laser source, including: a bus waveguide coupled, at an output end of the bus waveguide, to an output of the multi-channel laser source; a first semiconductor optical amplifier; a first back mirror; a first wavelength-dependent coupler, having a first resonant wavelength, on the bus waveguide; a second semiconductor optical amplifier; a second back mirror; and a second wavelength-dependent coupler, on the bus waveguide, having a second resonant wavelength, different from the first resonant wavelength. In some embodiments the first semiconductor optical amplifier is coupled to the bus waveguide by the first wavelength-dependent coupler, which is nearer to the output end of the bus waveguide than the second wavelength-dependent coupler, the second semiconductor optical amplifier is coupled to the bus waveguide by the second wavelength-dependent coupler, and the first wavelength-dependent coupler is configured to transmit light, at the second resonant wavelength, along the bus waveguide.

According to one embodiment, a display device includes a first arrangement layer and a second arrangement layer. The first layer includes a first pixel, a second pixel, and a third pixel are arranged periodically in one direction. The second layer is opposed to the first layer, and the second layer includes a first element, a second element, and a third element which are arranged periodically to correspond to the first pixel, the second pixel, and the third pixel, respectively, and separate emission light to light of wavelength corresponding to a first color, light of wavelength corresponding to a second color, and light of wavelength corresponding to a third color to be emitted on the first pixel, the second pixel, and the third pixel, respectively.

An optical device includes a plurality of optical ports for receiving optical beams. The optical device also includes a plurality of toric micro lenses each receiving one of the optical beams from a respective one of the optical ports. A dispersion element is provided for spatially separating in a dispersion plane the optical beam into a plurality of wavelength components. At least one focusing element is provided for focusing the plurality of wavelength components. A programmable optical phase modulator is also provided for receiving the focused plurality of wavelength components. The modulator is configured to selectively direct the wavelength components to prescribed ones of the optical ports. The toric lenses impart positive power to the optical beams in the port plane and negative optical power to the optical beams in a plane orthogonal to the port plane.

A method and system for increasing dynamic digitized wavefront resolution, i.e., the density of output beamlets, can include receiving a single collimated source light beam and producing multiple output beamlets spatially offset when out-coupled from a waveguide. The multiple output beamlets can be obtained by offsetting and replicating a collimated source light beam. Alternatively, the multiple output beamlets can be obtained by using a collimated incoming source light beam having multiple input beams with different wavelengths in the vicinity of the nominal wavelength of a particular color. The collimated incoming source light beam can be in-coupled into the eyepiece designed for the nominal wavelength. The input beams with multiple wavelengths take different paths when they undergo total internal reflection in the waveguide, which produces multiple output beamlets.

The temperature at different locations along a multiplexed laser array may be monitored by sensing temperature at two locations within a transmitter optical subassembly (TOSA) package housing the laser array. The temperature at the two locations is used to determine a temperature tilt across the laser array. Estimated temperatures may then be determined at one or more other locations along the laser array from the temperature tilt. The estimated temperature(s) may then be used to adjust the temperature proximate the other locations, for example, for purposes of tuning lasers at those locations along the laser array to emit a desired channel wavelength. The TOSA package may be used in an optical transceiver in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON).

According to embodiments of the present invention, an optical coupling device is provided. The optical coupling device includes a substrate, and a grating arrangement including a plurality of grating elements, the plurality of grating elements being defined on one surface of the substrate, wherein the plurality of grating elements are arranged to have a first period along a first direction, and a second period along a second direction orthogonal to the first direction, the first period being different from the second period. According to further embodiments of the present invention, a photonic integrated circuit and a method of forming an optical coupling device are also provided.

A 1N demultiplexer may include an input slab to distribute an input beam, including one or more wavelengths of light, among waveguides of a waveguide array. The wavelengths of light may comprise TE polarized light and TM polarized light. The 1N demultiplexer may include the waveguide array to propagate a plurality of beams via the waveguides. The 1N demultiplexer may include an output slab to cause N TE polarized beams and N TM polarized beams to be formed based on the plurality of beams. The 1N demultiplexer may include a set of N TE output ports and a set of N TM output ports coupled to the output slab. A TE output port may receive a TE polarized beam of the N TE polarized beams. A TM output port may receive a TM polarized beam of the N TM polarized beams.

Techniques for reducing optical fiber bending loss in an optical transceiver are disclosed. In an embodiment, a small form-factor (SFF) optical transceiver housing includes a demultiplexer device, such as an arrayed waveguide grating (AWG) device, having a longitudinal center line that is offset laterally by a distance D.sub.offset from the longitudinal center line of the SFF optical transceiver housing. The lateral offset distance D.sub.offset may advantageously enable an intermediate optical fiber coupling the demultiplexer with an optical coupling receptacle, such as an LC connector, to be routed within the SFF optical transceiver housing in a manner that avoids introducing bends that are less than a minimum bending radius associated with the intermediate optical fiber cable. Thus some embodiments of the present disclosure enable greater tolerance when routing an intermediate optical fiber within housings that would otherwise introduce bending loss by virtue of their constrained dimensions.

A near eye or heads up display system includes a display engine, at least two optical waveguides, and a respective coating on at least one of the major surfaces of at least one of the waveguides. At least one such coating has a low reflectance for light within a specific wavelength range for the waveguide and incident on a major surface of the waveguide on which the coating is located at an angle below a low threshold angle relative to a normal, and has a high reflectance for light within the specific wavelength range for the waveguide that is incident on the major surface on which the coating is located at an angle above a high threshold angle relative to the normal.