An optical fiber identifier apparatus and system are provided. The apparatus includes a housing forming a pathway at which an optical fiber is positionable. The housing forms a tip end that forms a bend of the optical fiber at the pathway. At least two lenses are positioned parallel to one another. Each lens defines an optical axis extended through the bend of the optical fiber and perpendicular to a longitudinal axis of the respective lens. A photo detector device is positioned to receive a beam of light from the optical fiber via the one or more lenses.

An optical fiber includes: a core; and a clad which is formed so as to surround an outer circumference of the core concentrically with the core, the clad having at least an inner cladding layer adjacent to the outer circumference of the core and an outer cladding layer formed on an outer circumference of the inner cladding layer, wherein a refractive index of the outer cladding layer is 3, and an outer circumference radius of the outer cladding layer is r3, a relationship of 1max>3>2min is satisfied, a relationship of 32min0.08% is satisfied, a relationship of r1<r2<r3 is satisfied, a relationship of 0.35r1/r20.55 is satisfied, a cable cut-off wavelength is less than or equal to 1260 nm, and an MFD at a wavelength of 1310 nm is 8.6 m to 9.2 m.

An optical construction (100) includes a lightguide (102), a transmissive reflector (112), and an optical sensor (114). The lightguide (102) includes a first major surface (104) and a second major surface (106) opposite to the first major surface (104). The first major surface (104) includes a first portion (108) and an adjoining second portion (110). The transmissive reflector (112) is disposed adjacent to the first major surface (104) of the lightguide (102). The optical sensor (114) is disposed adjacent to the transmissive reflector (112) opposite to the lightguide (102). The optical sensor (114) is aligned with the first portion (108) of the first major surface (104) of the lightguide (102), such that the optical sensor (114) receives at least a portion of light passing through the first portion (108) of the first major surface (104) and transmitted by the transmissive reflector (112). The optical construction (100) further includes an enclosed gap (116) disposed between the first portion (108) of the first major surface (104) of the lightguide (102) and the transmissive reflector (112).

An optical cavity is formed to have a circuitous configuration. The optical cavity is configured to receive light coupled from a waveguide. At least two photodetector sections are formed over respective portions of the optical cavity. Each of the at least two photodetector sections is configured to detect light present within the optical cavity. Each of the at least two photodetector sections is configured for separate and independent control.

An optical power monitor device includes a first optical fiber, including a core and a cladding surrounding the core and being at least one of an incidence-side optical fiber and a launch-side optical fiber connected to each other at a connection point, which is constituted by a curve portion and a linear portion between the curve portion and the connection point, a low refractive index layer that is provided in at least a portion of the linear portion on an outer side of the cladding and has a refractive index lower than a refractive index of the cladding, and a first optical detector that is provided at a position close to at least the curve portion.

Described embodiments include optical connections for electronic-photonic devices, such as optical waveguides and photonic detectors for receiving optical waves from the optical waveguides and directing the optical waves to a common point. Methods of fabricating such connections are also described.

The present disclosure provides an optical module, including a housing, a substrate, and an optical coupling configuration. The substrate is disposed in the housing. The optical coupling configuration includes an optical communication assembly and a bending fiber array. The optical communication assembly is disposed on the substrate. The optical communication assembly includes an optical communication unit and an electronic component, and the optical communication unit is electrically connected to the electronic component via a metal wire. The bending fiber array is optically coupled to the optical communication unit, and the bending fiber array is spatially spaced apart from the optical communication unit and the metal wire.

A waveguide coupler includes a first waveguide layer including a first waveguide, a second waveguide layer including a second waveguide optically coupled to the first waveguide, and a dielectric layer between the first waveguide layer and the second waveguide layer in a first direction (e.g., vertical direction). A distance between the first waveguide and second waveguide in a second direction (e.g., a horizontal direction) that is perpendicular to the first direction is greater than zero, and has different values at two or more different sections of the waveguide coupler along a third direction (e.g., the light propagation direction).