| 摘要 |
An optical device includes a first input port, a first output port, a second output port, at least one filter, at least one reflector, a first reflection unit and a second reflection unit. The filter receives optical signals having wavelengths of lambd1 to lambdn from the first input port, selectively transmits the optical signal having a wavelength of lambdi, and reflects other optical signals, wherein 1<=i<=n. The first reflection unit reflects the optical signal having the wavelength of lambdi back to the filter, so that the optical signal having the wavelength of lambdi can pass through the filter and can be output from the first output port. The reflector reflects the optical signals having the wavelengths of lambd1 to lambdn except for lambdi from the filter. The second reflection unit reflects the optical signals having the wavelengths of lambd1 to lambdn except for lambdi back to the reflector, so that after being reflected by the reflector and the filter, the optical signals having the wavelengths of lambd1 to lambdn except for lambdi are output from the second output port.
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