Optical: systems and elements – Prism – With reflecting surface
Patent
1992-01-21
1993-07-06
Henry, Jon W.
Optical: systems and elements
Prism
With reflecting surface
385 31, 385 36, G02B 504, G02B 520, G02B 634
Patent
active
052259420
ABSTRACT:
An optical signal band-pass filter module permitting a light which is transmitted through a band-pass filter twice so that the central wavelength in a transmittance bandwidth thereof is prevented to be varied. The optical signal band-pass filter comprises a first optical fiber for emitting a first light, a first lens connected to the first optical fiber by way of a holder for converting the first light into a parallel light, a band-pass filter which is confronted with the first lens, on which the parallel light is incident, a right-angled prism confronted with the band-pass filter, the right-angled prism capable of turning the traveling direction of the parallel light after it has been transmitted through the band-pass filter, reversing the light after it has been reflected thereby, and of permitting the reversed light incident on the band-pass filter, a second lens confronted with the band-pass filter, the second lens capable of collecting the reversed light after it has been transmitted through the band-pass filter, and a second optical fiber connected to the second lens by way of a second holder through which the reversed light is emitted.
REFERENCES:
patent: 4569569 (1986-02-01), Stewart
patent: 4589726 (1986-05-01), Buhrer
Ikeno Hideki
Ohki Kazuhiro
Ando Electric Co. Ltd.
Henry Jon W.
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