The proposed technology relates to a window cover for a sensor package, in which a partition wall is provided between a light emitting device and a light receiving device to improve sensing accuracy and reliability of the sensor package. The proposed window cover includes: a base disposed in a direction in which light is emitted from a light source; a light emitting device cover extending from a first surface of the base and disposed at an upper portion of a light emitting device of the sensor package; and a light receiving device cover having the first surface of the base as a bottom surface thereof, and disposed at an upper portion of a light receiving device of the sensor package, wherein an outer circumference of the light emitting device cover extends in a direction opposite to the direction in which the light is emitted to form a partition wall.

An optical device includes a unitary substrate of optically transparent material. The unitary substrate has formed therein at least one collection lens and channel, the channel for receiving an optical fibre and arranged to align the optical fibre inserted therein such that the collection lens couples light collected by the collection lens into the optical fibre.

A wavelength-tunable fiber optic light source and an overlay measurement device including a wavelength-tunable fiber optic light source are provided. A wavelength-tunable fiber optic light source may include a broadband light source configured to emit light; a light source housing to receive the broadband light source, wherein in the light source housing, a first window and a second window through which the light emitted from the broadband light source passes are formed; a first variable filter configured to adjust a wavelength band of a first illumination; a second variable filter configured to adjust a wavelength band of a second illumination; and a fiber combiner including an output port through which a combination of the first illumination and the second illumination is output.

A signal light transmission member includes an AR coated lens, a light transmission part, and an optical fiber. The refractive index of the light transmission part has a specific relationship with the refractive index of a core material of the optical fiber. An anti-reflective coating is formed at an interface portion between the lens of the AR coated lens and the light transmission part.

Embodiments herein describe a fiber array unit (FAU) configured to couple a photonic chip with a plurality of optical fibers. Epoxy can be used to bond the FAU to the photonic chip. However, curing the epoxy between the FAU and the photonic chip is difficult. As such, the FAU can include one or more optical windows etched into a non-transparent layer that overlap with epoxy wells in the photonic chip. Moreover, the FAU may include a transparent substrate on which the non-transparent layer is disposed that permits UV light to pass therethrough. As such, during curing, UV light can be pass through the transparent substrate and through the optical windows in the non-transparent layer to cure the epoxy disposed between the FAU and the photonic chip.

An expanded beam fiber optic array connector includes a ferrule holding ends of optical fibers in a first ordered array. A plurality of lenses packaged into a unitary structure, formed of an optical grade material, different than a material used to form the ferrule, is attached to the ferrule. The lenses are arranged into a second ordered array matching the first ordered array of the ends of the optical fibers. The lenses of the expanded beam connector associated with transmit channels can be constructed with a prescription geared specifically for transmitting light, whereas the lenses of the expanded beam connector associated with receive channels can be constructed with a prescription geared specifically for receiving light.

The present disclosure relates to an optical sensor protection system. The system may have a sensor for receiving an incoming optical signal, a passive sensing and modulation component, and an active sensing and modulation subsystem. The passive sensing and modulation component is configured to sense when a first characteristic is associated with the incoming optical signal is present that adversely affects operation of the sensor, and redirects at least a portion of the incoming optical signal thereof away from the sensor to thus reduce an intensity of the incoming optical signal reaching the sensor. The sensor is located on an image plane downstream of the ISM subsystem, relative to a path of travel of the incoming optical signal. The active sensing and modulation subsystem has an active modulation component and is located upstream of the passive sensing and modulation component, relative to the path of travel of the incoming optical signal, and is also located on a conjugate image plane, and is configured to use the redirected portion of the incoming optical signal as feedback in controlling a modification of the incoming optical signal to reduce a risk of damage to the passive sensing and modulation component.

A method for terminating a plurality of optical fibers arranged in a two-dimensional arrangement comprises inserting the plurality of optical fibers into and through a fiber ferrule, where the fiber ferrule has a plurality of parallel channels extending from an entry surface through to a polish surface; polishing the polish surface including an end of each of the plurality of optical fibers to form a coplanar surface at a polish angle relative to a reference plane perpendicular to the parallel channels; and affixing a glass plate to the polish surface.

A ferrule includes a body and a lens part. The body includes a first connecting surface at which a slit for inserting an optical waveguide is open. The lens part includes a lens and a second connecting surface. The lens part is bonded to the body with an adhesive with the second connecting surface facing and contacting the first connecting surface. At least one of the first connecting surface and the second connecting surface includes a curved surface.

The micro-optical systems disclosed herein employ a glass tube having a body, a front end, a back end, an outer surface, and a bore that runs through the body between the front and back ends and that has a bore axis. The outer surface has a maximum outer dimension between 0.1 mm and 20 mm and includes at least one flat side. At least one optical element is inserted into and operably disposed and secured within the bore. The micro-optical assemblies are formed by securing one or more micro-optical systems to a substrate at the flat side of the glass tube. The glass tube is formed by a drawing process that allows for the dimensions of the glass tube to be small and formed with relatively high precision. An example of a compact WDM micro-optical assembly that employs micro-collimators is disclosed.