Abstract: The invention provides a heat dissipating device comprising: a heat generating unit, which generates heat when under operation and is placed at a first side of the heat dissipating device; a heat sensitive object, which is placed at a second side of the heat dissipating device; and an air layer, which is arranged in between the heat generating unit and the heat sensitive object. The heat generated by the heat generating unit is isolated by the air layer.

Abstract: The invention provides a signal detector. The signal detector comprises a housing, having a connector and a display unit; a tuner, configured to receive a cable signal; a microcontroller unit (MCU), electrically connected with the tuner and the display unit; a scanning switch, electrically connected with the MCU; a power supply, configured to supply a power to the MCU; and a power switch, electrically connected with the MCU.

Abstract: A high extinction-ratio rotator includes a collimator that can collimate a signal light from an optical fiber, a pair of polarizing splitting prisms that include a first birefringence crystal wedge and a second birefringent crystal wedge, that can separate two orthogonal polarization components of the signal light into a vertically polarized light and a horizontally polarized light, a non-reciprocal 45-degree polarization rotator which the vertically polarized light and the horizontally polarized light exiting the pair of polarizing splitting prisms pass through, and a reflector. The vertically polarized light and the horizontally polarized light exiting the non-reciprocal 45-degree polarization rotator intersect on a surface of the reflector and are reflected back into the non-reciprocal 45-degree polarization rotator.

Abstract: A semiconductor laser shaping device includes, along the light path of a semiconductor laser, a fast axis collimating lens, slow axis collimating lens, the half wave plate, a polarization beam combining prism, and a crawling prism group. The laser emitted by the semiconductor laser is collimated by a fast-axis collimating lens and then by a slow-axis collimating lens, and subsequently injected into a half wave plate and polarization beam combining prism, which compresses its spot size along the slow axis while keeping the spot size unchanged along the fast axis. The laser beam then passes through the crawling prism group, which shifts a portion of the light in the slow-axis direction to the fast-axis direction, which again compresses the light beam in the slow-axis direction. The device can reduce the beam size of a semiconductor laser in the slow-axis direction, reducing its beam parameter product and improving beam quality.

Abstract: An external battery backup unit includes a battery cell set, a power relay, a charging controller, a voltage and current monitoring unit, a microcontroller and a signaling coupling unit. The charging controller is configured to monitor the status of the battery cell set and the power relay in order to determine a charging current's amplitude. The voltage and current monitoring unit monitors the status of the battery cell set to control a discharging current's amplitude. The microcontroller is configured to respond to the change of state of the charging controller, the voltage and current monitoring unit, and the battery cell set. The microcontroller further generates the external battery backup unit's system information and encapsulates it into data envelopes. The signaling coupling unit is configured to embed the data envelopes into the power transmitted to the backend system.

Abstract: A heat dissipating structure generally utilized in a telecommunication product includes a plurality of PCB modules, a metal framework, a top lid, and a perforated panel. The heat dissipating structure is generally utilized in a telecommunication product. The plurality of PCB modules are coupled in series and configured to form a chassis. The metal framework is housed within the chassis and forms an internal chamber. The top lid is disposed at a top side of the heat dissipating structure. The perforated panel is disposed below the top lid and over the internal chamber. The perforated panel includes a plurality of ventilation holes. The internal chamber cooperates with the plurality of ventilation holes to dissipate heat.