Mega-9
Advanced optical narrow bandpass
filter and beam splitter cubes
855nm narrow bandpass filter,FWHM:30nm
Price:$100(FOB Shanghai)
Store:2 pcs 
Size:Ø11*0.55mm
CWL:855nm
FWHM:30nm
Type: narrow bandpass filter
Specifications:
Substrate material: Float glass
Dimension(mm):11.4x11.4,Ø12.5x6(mounted),Ø25.4x6(mounted),Custom
Angle of incidence:0 degree
Center wavelength:855 nm
FWHM:30 nm
Tpeak: T>85% at 855 nm
Blocking: OD3-A What is OD?
Min. clear aperture(mm): >11x11(11.4x11.4),>Ø8.7(v12.7),>Ø21(Ø25.4)
Other: Customed,Store id: CP1-3-2
Note: Other dimension and specification are available upon request.
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Mega-9 Optical supplies advanced narrow bandpass filter with high quality and fast delivery.
5. The optical filter of claim 4, wherein the displacement sensor includes a capacitance sensor coupled to the first optical element for measuring the change in the capacitance that depends on the change in the displacement of the first optical element. 6. The optical filter of claim 1, wherein both of the first and second optical elements is tunable to change each of the respective first and second wavelengths. 7. The optical filter of claim 6 further comprising: a first compressing device for compressing axially the first element to tune the first reflective element, wherein the first reflective element is written in the longitudinal direction in the first optical element; and a second compressing device for compressing axially the second optical element to tune the second reflective element, wherein the second reflective element is written in the direction in the second optical element. An optical filter, including a pair of Bragg grating units optically coupled to respective ports of a circulator, is provided for filtering a selected wavelength band of light from a DWDM input light. Each grating unit includes a respective tunable optical element, which have a reflective element, such as a Bragg grating. Generally, one grating unit filters a selected wavelength band of light and reflects the selected wavelength band to the other grating unit, which reflects a portion of the reflected wavelength band to an output of the optical filter. This double reflection of the selected wavelength band provides an optical filter having an effective filter function that is equal to the product of the individual filter functions of the grating units. To create a desired effective filter function, the gratings may be written to have different filter functions or grating profiles. One or both of the grating units may also be tunable to selectively create, tailor, shape or change the effective filter function of the optical filter in response to a control signal by offsetting the reflection wavelengths of the gratings, having different grating profiles.
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