An optical cage system uses four rigid steel rods to mount optical components along a common optical axis. Cage systems are available with center-to-center rod spacings of 16 mm, 30 mm, or 60 mm so as to accommodate Ø1/2", Ø1", or Ø2" optics, respectively. Thorlabs provides an extensive selection. Each of the optical module cages 12 - 1 - 12 - 3is formed in a box shape with an insertion slot 12 - 1 a at an end, and has a lock piece 12 - 1 c with a lock hole 12 - 1 b in the position facing the insertion slot 12 - 1 a. the optical module 20is inserted in and attached to only the uppermost. Simply put, a fiber optic cage (also commonly called an optical transceiver cage or cage assembly) is a precision metal housing designed to securely hold, align, and connect an optical transceiver module to a printed circuit board (PCB). Operating at the physical layer of the OSI model, optical modules are core devices in optical.
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