A waveguide display for use in a near-eye display system includes a waveguide stack having at least one waveguide substrate, an input coupler coupling light into the waveguide substrate and an optical arrangement that includes a birefringent reflective polarizer, a mirror and a polarization state converting element configured to convert light in a linear polarization state to a circular polarization state and to convert light in a circular polarization state to a linear polarization state. The mirror is arranged to receive light from the polarization state converting element and reflect the light back to the polarization state converting element. The optical arrangement causes a transmission path of light that traverses the waveguide stack a first time to be folded back through the waveguide stack such that at least a portion of light not coupled into the waveguide substrate is caused to traverse the waveguide stack a plurality of additional times.

Waveguide combiners having a pass-through in-coupler grating are described herein. The waveguide combiners include at least one microdisplay and a stack of at least two waveguide layers. In one configuration of a waveguide combiner described herein, the green FOV and the blue FOV only propagate in a first waveguide and the red FOV only propagates in a second waveguide. In another configuration of a waveguide combiner described herein, the blue FOV, the red FOV, and the green FOV only propagate in the first waveguide, the second waveguide, and a third waveguide respectively. The waveguide combiners including the stack of waveguide layers reduces luminance non-uniformity, color non-uniformity, double-images, and other non-uniformities of the overlayed images from a first microdisplay and, in some embodiments, a second microdisplay.

A waveguide display for use in a near-eye display system includes a waveguide stack having at least one waveguide substrate, an input coupler coupling light into the waveguide substrate and an optical arrangement that includes a birefringent reflective polarizer, a mirror and a polarization state converting element configured to convert light in a linear polarization state to a circular polarization state and to convert light in a circular polarization state to a linear polarization state. The mirror is arranged to receive light from the polarization state converting element and reflect the light back to the polarization state converting element. The optical arrangement causes a transmission path of light that traverses the waveguide stack a first time to be folded back through the waveguide stack such that at least a portion of light not coupled into the waveguide substrate is caused to traverse the waveguide stack a plurality of additional times.

A system for monitoring a signal on an optical fiber includes a fiber optic connector having a housing couplable to a receptacle. An optical fiber that transmits a first optical signal has first fiber core at least partially surrounded by a cladding and has a first end terminating proximate the housing. The first optical signal is transmitted along the first fiber core. An optical tap has a first tap waveguide arranged and is configured to receive at least part of the first optical signal as a first tap signal. The first tap waveguide comprises an output port for the first tap signal for directing the tap signal to a detector unit. In other embodiments, a detector unit detects light from the optical signal that is propagating along the fiber cladding.

The present disclosure relates to a hybrid opto-electrical module apparatus. The apparatus may have a module substrate having a plurality of electrically conductive circuit traces for carrying electrical signals, and at least one waveguide element for carrying optical signals. A waveguide substrate is in optical communication with the waveguide element. A transducer is supported on the waveguide substrate and in electrical communication with the circuit traces. The waveguide substrate has at least one three dimensional (3D) waveguide formed within its interior volume for routing optical signals between the waveguide element and the transducer. A first optical wirebond interfaces the waveguide element to the 3D waveguide, and a second optical wirebond interfaces the 3D waveguide to the transducer.

A planar waveguide device (PWD) for interacting with a fluid (FLD) is disclosed, the planar waveguide device (PWD) comprising a waveguide layer (WGL) for supporting optical confinement, a coupling arrangement (CPA) for in-coupling and out-coupling of light into and from the waveguide layer (WGL), a fluid zone (FZN) for accommodating the fluid (FLD), a filter layer (FTL) arranged between the fluid zone (FZN) and the waveguide layer (WGL) in an interaction region (IAR) of the waveguide layer (WGL),
wherein the filter layer (FTL) comprises filter openings (FOP) arranged to allow the fluid (FLD) to interact with an evanescent field of light guided by the waveguide layer (WGL),
wherein the filter openings (FOP) are adapted to prevent particles (PAR) larger than a predefined size from interacting with said evanescent field,
wherein the filter openings (FOP) are arranged as line openings having their longitudinal direction in parallel with the direction of propagation (DOP) of light guided by the waveguide layer (WGL).

Methods, systems, and devices are disclosed for implementing a fiber-waveguide evanescent coupling. In one aspect, a device having integrated photonic components includes a substrate, a waveguide formed on the substrate to include a terminal waveguide portion that terminates at one side of the substrate, and a fiber including a fiber core and fiber cladding surrounding the fiber core, in which at least a portion of the fiber cladding is removed at or near a fiber terminal end to enable optical evanescent coupling via a side surface of the fiber core at the or near the fiber terminal end, the fiber core at the or near the fiber terminal end is placed over the one side of the substrate to be above and to overlap with the terminal waveguide portion of the waveguide to enable optical evanescent coupling via side surfaces of the fiber core and the waveguide.

Optical coupling designs are disclosed to provide a photonic device, for example, that includes a substrate; an optical waveguide formed on the substrate and configured as a multimode waveguide to support light in different optical waveguide modes; and an optical fiber structured as a multimode fiber to support light in different optical fiber modes, the optical fiber located above the optical waveguide and optically coupled to the optical waveguide via evanescent coupling to allow light to be coupled between the optical fiber and the optical waveguide.

To reduce the size while being able to accurately monitor light of a plurality of wavelengths. An optical multiplexing circuit includes: a plurality of branching units each configured to divide light output from a corresponding one of a plurality of input waveguides; a multiplexing unit configured to multiplex beams each being one beam of the light divided by each of the plurality of branching units; an output waveguide configured to output the light multiplexed by the multiplexing unit; and a plurality of monitoring waveguides each configured to output another beam of the light divided by each of the plurality of branching units, wherein at least one monitoring waveguide of the plurality of monitoring waveguides includes a bent waveguide constituted by a rib-shaped waveguide.

To reduce the size while being able to accurately monitor light of a plurality of wavelengths. An optical multiplexing circuit includes: a plurality of branching units each configured to divide light output from a corresponding one of a plurality of input waveguides; a multiplexing unit configured to multiplex beams each being one beam of the light divided by each of the plurality of branching units; an output waveguide configured to output the light multiplexed by the multiplexing unit; and a plurality of monitoring waveguides each configured to output another beam of the light divided by each of the plurality of branching units, wherein at least one monitoring waveguide of the plurality of monitoring waveguides includes a bent waveguide constituted by a rib-shaped waveguide.