Abstract: Disclosed is a submarine network device, comprising a fiber set, a pump laser set, an erbium doped fiber amplifier (EDFA) set, a primary fiber coupler (CPL) set and a secondary CPL set, wherein the primary CPL set comprises N primary CPLs, the secondary CPL set comprises N secondary CPLs, with N being an integer greater than or equal to 3. The fiber set is configured to connect the pump laser set, the primary CPL set, the secondary CPL set and the EDFA set. An input port of each primary CPL in the primary CPL set is at least connected with a pump laser. An output port of each secondary CPL in the secondary CPL set is at least connected with an EDFA. Output ports of each primary CPL in the primary CPL set are respectively connected with two different secondary CPLs that are spaced by a secondary CPL, and input ports of each secondary CPL in the secondary CPL set are respectively connected with two different primary CPLs that are spaced by a primary CPL.

Abstract: To address the deficiencies in the prior art, the present invention provides a laser sensor for human body safety protection for use in a revolving door, which comprises: a laser scan range calculation section and an application analysis section. The laser scan range calculation section comprises a laser emitting device, a laser deflecting device, an optical signal receiving device, and an analyzing and processing device. Wherein, the laser emitting device emits laser signals to the laser deflecting device; the laser deflecting device deflects the laser signals by a pre-set angle and forms at least one laser scan area; the optical signal receiving device receives returned laser signals and transmits said signals to the analyzing and processing device. The analyzing and processing device comprises a trigger point distance analyzing module, which makes analysis to obtain trigger point distance information according to signals sent from the optical signal receiving device.