679nm narrow bandpass filter
Item#:NBPF679/15
Price:$100
CWL:679nm
Type: narrow bandpass filter
FWHM:15nm
Specifications:
Substrate material: Float glass
Dimension: Ø12.5x6(mounted),Custom
Angle of incidence: 0
Center wavelength: 679nm(+2/-2nm)
Full width at half maximum: 15nm(+3/-3nm)
Min. transmission: >60% @ 679nm,cut-off from 200nm to 1100nm(typical),T<0.01%
Min. clear aperture: >85% of diameter
Note: Other dimension and specification are available upon request.
Knowledge & Tips
Mega-9 Optical supplies advanced narrow bandpass filter with high quality and fast delivery.
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.12. The optical filter of claim 1, wherein the first reflection wavelength and the second reflection wavelength are substantially aligned to reflect a portion of the aligned wavelength bands to an output port. 13. The optical filter of claim 1, wherein one of the first and second reflective filter functions comprises one of a Gaussian, rectangular and ramp shape. 14. The optical filter of claim 1, wherein one of the first and second reflective elements is fully apodized and the other of the first and second reflective elements is partially apodized. 15. The optical filter of claim 1, wherein the first reflection wavelength is offset a predetermined spacing from the second reflection wavelength.
Mega-9 Optical supplies advanced 679nm narrow bandpass filter,high quality,fast delivery,tel:86-21-57784688. 679nm narrow bandpass filter
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