Abstract: A dense wavelength division multiplexer (DWDM) module (10) includes a housing (1), a retainer (2), a plurality of DWDMs (3), a cover (4), a gasket ring (5) and a front seal (8). The retainer is fixed in the housing and receives the DWDMs therein. Optical fibers communicating between the DWDMs and optical components outside the DWDM module pass through strain relief boots (81), which engage in through holes in a plug (82) of the front seal. The front seal is tightly fixed in a slot (124) of the housing, forming a reliable seal at the front of the housing. The gasket ring is pressed into a recess (122) of the housing. The cover is then fixed on the housing and presses against the gasket ring. Therefore, a tight hermetical seal is formed between the housing and the cover.

Abstract: A device holder (10) adapted to be used in an optical module box (2) for retaining WDMs (1). The device holder is injection molded and made of a specific thermoplastic material that can help maintain a normal operating temperature of the WDMs mounted in the optical module box. The device holder comprises a mounting substrate (12), a plurality of protrusions (14) extending upwardly from the substrate, and two side mounting beams (161a) and a middle mounting beam(161b). Adjacent protrusions form mounting grooves (15) for retaining the WDMs therein. The device holder is mounted to the bottom of the optical module box by screws.

Abstract: A dense wavelength division multiplexer (DWDM) module (10) includes a housing (1), a retainer (2), a plurality of DWDMs (3), a cover (4), a gasket ring (5) and a front seal (8). The retainer is fixed in the housing and receives the DWDMs therein. Optical fibers communicating between the DWDMs and optical components outside the DWDM module pass through strain relief boots (81), which engage in through holes in a plug (82) of the front seal. The front seal is tightly fixed in a slot (124) of the housing, forming a reliable seal at the front of the housing. The gasket ring is pressed into a recess (122) of the housing. The cover is then fixed on the housing and presses against the gasket ring. Therefore, a tight hermetical seal is formed between the housing and the cover.

Abstract: A device holder (10) adapted to be used in an optical module box (2) for retaining the WDMs (1). The device holder is injection molded and made of a specific thermoplastic material that can help maintain a normal operating temperature of the WDMs mounted in the optical module box. The device holder comprises a mounting substrate (12), a plurality of protrusions (14) extending upwardly from the substrate, and two side mounting beams (161a) and a middle mounting beams (161b). Wherein adjacent protrusions forms a mounting groove (15) for retaining the WDMs therein. The device holder is mounted to the bottom of the optical module box by screws.