Aspects of a symmetric coherent optical mixer are described. In one example, the coherent optical mixer includes a group of symmetric MMI couplers and a group of symmetric bend waveguides optically coupled between the MMI couplers. The group of symmetric MMI couplers can include an input for a local light reference signal, an input for a modulated light signal, and outputs for detection of data from the modulated light signal. The group of symmetric MMI couplers can include four MMI couplers, each of which comprises a 22 MMI coupler of symmetric dimension. The group of symmetric bend waveguides can include a symmetric layout of four 90 bend waveguides optically coupled between the four MMI couplers. The coherent optical mixer, which can be implemented as a Silicon Photonics (SiPh) device, provides better performance as a 90 degree optical hybrid than prior mixer devices due to its symmetric layout.

An electromagnetic holding magnet and a method for manufacturing the same, and an electromagnetic locking element that, that in a preferred embodiment, is a lock in a container of an oxygen emergency supply system of an aircraft. The electromagnetic holding magnet includes a yoke and a retaining plate interacting with the yoke as an anchor. At least one permanent magnet generates a magnetic retaining flux in the yoke that includes a first yoke leg and a second yoke leg as well as a middle pole. The middle pole is surrounded in sections by a magnetic coil. The first and second yoke legs are arranged symmetrically in relation to the middle pole and the magnetic coil.

A locking apparatus for a rollup door, comprising a striker member, latch assembly including a latch, a release lever, a trigger, a cam and a solenoid. The latch assembly may also include a limit switch for detecting when the latch assembly is in an unlocked position. The locking apparatus can be electronically unlocked or it can be unlocked manually by a user by actuating the solenoid which causes the latch to release the locked striker member.

An electronic release system configured to unlock a hold open rod mechanism or latch mechanism includes an actuator interface configured with an input device and an actuator associated with the hold open rod mechanism or the latch mechanism. The input device configured to be actuated by personnel to initiate operation of an unlocking mechanism associated with the hold open rod mechanism or the latch mechanism. The electronic release system also includes a wiring assembly configured to connect the actuator interface to the actuator. The actuator interface configured to determine actuation of the input device and signal the actuator over the wiring assembly. The actuator being configured to operate the unlocking mechanism associated with the hold open rod mechanism or the latch mechanism.

Aspects of a symmetric coherent optical mixer are described. In one example, the coherent optical mixer includes a group of symmetric MMI couplers and a group of symmetric bend waveguides optically coupled between the MMI couplers. The group of symmetric MMI couplers can include an input for a local light reference signal, an input for a modulated light signal, and outputs for detection of data from the modulated light signal. The group of symmetric MMI couplers can include four MMI couplers, each of which comprises a 22 MMI coupler of symmetric dimension. The group of symmetric bend waveguides can include a symmetric layout of four 90 bend waveguides optically coupled between the four MMI couplers. The coherent optical mixer, which can be implemented as a Silicon Photonics (SiPh) device, provides better performance as a 90 degree optical hybrid than prior mixer devices due to its symmetric layout.

A locking device includes a mobile locking member, movement of which can be prevented by a blocking member interacting with a motorized lever, where the motorized lever is capable of rotational movement about an axis with respect to the supporting structure, the centre of gravity of the lever lying on the axis, the lever being kept in a determined stable position and without rigid mechanical contact of the lever with the supporting structure apart from its axis of rotation.

A low-voltage, direct current apparatus for controlling a door, gate, or other access point to a structure or enclosed area. In some embodiments, the apparatus may comprise a housing, a face plate coupled to the housing, a strike plate coupled to the housing, and a keeper disposed between the face plate and the strike plate. The keeper may be rotatably coupled to the housing and may have a cavity configured to receive a latch coupled to a door or other access point. A motor may be disposed within the housing, and a shaft may be coupled to the motor. An actuator arm may be coupled to the shaft. The motor may be operable to rotate the shaft to move the actuator arm from a locked position to prevent movement of the keeper to an unlocked position to allow movement of the keeper.

A motorized latch retraction system for transitioning a latch of an exit device from a latched position to an unlatched position is provided. The motorized latch retraction system includes a lock indicator indicating the latched or unlatched position of the latch and a floating motor.

A low-voltage, direct current apparatus for controlling a door, gate, or other access point to a structure or enclosed area. In some embodiments, the apparatus may comprise a housing, a face plate coupled to the housing, a strike plate coupled to the housing, and a keeper disposed between the face plate and the strike plate. The keeper may be rotatably coupled to the housing and may have a cavity configured to receive a latch coupled to a door or other access point. A motor may be disposed within the housing, and a shaft may be coupled to the motor. An actuator arm may be coupled to the shaft. The motor may be operable to rotate the shaft to move the actuator arm from a locked position to prevent movement of the keeper to an unlocked position to allow movement of the keeper.

A magnetic release mechanism for use with underwater fishing equipment includes a base plate having a slot for receiving a buckle, and a recess for receiving a release plate. A permanent magnet positioned proximate the recess generates a first magnetic field for magnetically coupling the release plate to the base plate. An electromagnetic coil positioned proximate the permanent magnet is configured to selectively generate a second magnetic field when energized. A magnetic field sensor is positioned proximate the recess. A controller is operatively coupled to the magnetic field sensor. The controller may be configured to monitor the magnetic field sensor to detect the presence of a third magnetic field and, in response to detecting the presence of a third magnetic field, output a signal indicating that the release plate is magnetically secured within the recess.