| 摘要 |
An electrical variable optical attenuator includes a housing (1), a cover (2), an optical module (3), and a shifting device (4). The optical module comprises a reflective device (31), a graded transmittance filter (32), a filter carrier (33), and a container (38). The reflective device is an integrated piece comprising a first reflective plane (311), a second reflective plane (312), and an opening (313) movably accommodating the graded transmittance filter therein. The first and the second reflective planes are substantially perpendicular to each other. Because the first and second reflective planes are integrally formed on the reflective device, the attenuator is relatively easy to assemble. In addition, the attenuator is able to operate reliably in rugged conditions, including applications where the attenuator may be subjected to vibration, shock or extreme temperatures.
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