The present disclosure provides an optical fiber ferrule adapter. The optical fiber ferrule adapter comprises a first ceramic ferrule, an output optical fiber assembly, and a first collimating lens, a second collimating lens, a half wave plate, a Faraday rotator, a first birefringence member and a second birefringence member which are provided between the first ceramic ferrule and the output optical fiber assembly. The first birefringence member is adjacent to the first ceramic ferrule, the second birefringence member is adjacent to the output optical fiber assembly; the first collimating lens, the second collimating lens, the Faraday rotator and the half wave plate are arranged between the first birefringence member and the second birefringence member; the Faraday rotator is positioned between the first collimating lens and the second collimating lens. The optical fiber ferrule adapter can isolate a reverse light and have a smaller structural dimension, which meets the trend of miniaturization.

An optical coupling device can couple incident light from a fiber into waveguides, but can reduce the coupling of return light from the waveguides into the fiber. A Faraday rotator layer can rotate by forty-five degrees, with a first handedness, respective planes of polarization of incident beams, and can rotate by forty-five degrees, with a second handedness opposite the first handedness, respective planes of polarization of return beams. A redirection layer can include at least one grating coupler that can redirect an incident beam of one polarization so that the redirected path extends within the redirection layer toward a first waveguide, and can redirect an incident beam of an opposite polarization so that the redirected path extends within the redirection layer toward a second waveguide. An optional birefringent layer can spatially separate incident beam having different polarizations, so that two single-polarization grating couplers can be used.

An optoelectronic assembly may include a photonic integrated circuit (PIC) with a top surface and a laser with a top surface and a bottom surface. The optoelectronic assembly may also include a housing configured to cooperate with the PIC to one or both of house and support one or more components. The housing may include a PIC mount including a first surface to interface with the top surface of the PIC, and a laser mount including a second surface to interface with the top or bottom surface of the laser. The first surface and the second surface may be parallel to each other.

An apparatus includes a substrate. A laser is formed on a non-self supporting structure and bonded to the substrate. A waveguide having a gap portion is deposited proximate the laser. The waveguide is configured to communicate light from the laser to a near-field transducer (NFT) that directs energy resulting from plasmonic excitation to a recording medium. An optical isolator is disposed over the gap portion.

An optical semiconductor device comprises: a first wiring pattern provided on a carrier mounting surface of a dielectric substrate; a first reference potential pattern surrounding the first wiring pattern; a carrier block provided on the carrier mounting surface and having a main surface, a side surface, and a second wiring pattern and a second reference potential pattern constituting coplanar lines; and an optical semiconductor element provided on the main surface. One end portion of the second wiring pattern extends to at least an end edge on the side surface side in the main surface and is conductively joined to the first wiring pattern with a conductive joining material therebetween. One end portion of the second reference potential pattern extends to at least the end edge on the side surface side in the main surface and is conductively joined to the first reference potential pattern with a conductive joining material therebetween.

An optical module includes a housing, at least one optical assembly and at least one sealing member. The housing includes a housing body, a cover and at least one vent hole therein. At least part of each optical assembly is located in the housing body. Each sealing member is located at a respective one of the at least one vent hole. The sealing member has a central axis and includes a first cylinder, a truncated cone, and a second cylinder, a diameter of the first cylinder is greater than a diameter of the second cylinder. Each vent hole is a stepped hole including a portion with a first aperture and a portion with a second aperture, the first aperture is greater than the second aperture. The first cylinder fits the portion with the first aperture, and the second cylinder fits the portion with the second aperture.

A distributed acoustic sensing (DAS) system based on space-division multiplexing with multi-core fiber (MCF) is proposed. It relates to a technical field of distributed optical fiber sensing. The present invention maintains the advantage of single-ended measurement in the standard DAS system, and realizes the intensity accumulation of the Rayleigh backscattering light within each core of the MCF, which can greatly improve the strain resolution of DAS systems. Moreover, the introduction of optical switch can make different code sequences transmit in the different core of the MCF simultaneously, which can make the single-pulse response with coding gain demodulated without sacrificing the frequency responding bandwidth. Furthermore, the utilization of space-division multiplexing can make multiple pulses with precious time delay transmit in the MCF simultaneously, which can greatly improve the frequency responding bandwidth of DAS system.

An optoelectronic package includes a substrate having a first surface and a second surface opposite to the first surface, an optoelectronic device on the first surface of the substrate, and a first conductive through via connecting the first surface and the second surface of the substrate. The optoelectronic device is electrically connected to the first conductive through via. A method for manufacturing the optoelectronic package is also provided.

An optical multiplexer includes a polarizer, a receptacle, a rotator disposed between the polarizer and the receptacle to rotate polarization planes of a pair of linearly polarized light beams in a forward direction and a polarization plane of a light beam in an opposite direction by 45 degrees, the forward direction being from the polarizer toward the receptacle, the opposite direction being from the receptacle to the polarizer, and a birefringent prism disposed between the rotator and the receptacle to multiplex the pair of linearly polarized light beams in the forward direction and to split the light beam in the opposite direction into an ordinary ray and an extraordinary ray. The rotator and the birefringent prism are fixed to the receptacle.

Embodiments of the present disclosure are directed to an optical transceiver within a single device. The optical transceiver incorporates an optical isolator, thus eliminating the need for an external isolator unit. In embodiments, transmitter channels and receiver channels share a single lens array and incorporate a compensator block to equalize the transmitter and receiver optical signals in the transceiver. Other embodiments may be described and/or claimed.