Optical bandpass filter using long period gratings

Details Optical bandpass filter using long period gratings Optical bandpass filter using long period gratings

2005-12-27

2005-12-27

Doan, Jennifer (Department: 2874)

Coherent light generators

Particular resonant cavity

C385S015000, C385S031000, C385S037000, C372S102000

Reexamination Certificate

active

06980578

ABSTRACT:
The specification describes an optical filter wherein long period gratings (LPGs) are used in a new configuration to provide in-line bandpass filtering of optical signals. In the basic embodiment, two dissimilar LPGs are installed in the optical fiber transmission line. The first LPG converts light, over a broad wavelength range, being transmitted in the fundamental, or LP01, mode of the optical fiber transmission line into light in a higher order mode (HOM) of the optical fiber. The mode-converted signal, with mode LPm,n, is then coupled to a second waveguide, the second waveguide having transmission characteristics different from those of the first. The second waveguide supports propagation of light in a LPm,nmode. The mode-converted signal is then transmitted through a second LPG where the signal over a selected narrow band of wavelengths that is accepted by the second LPG is converted back to a LP01mode.

REFERENCES:
patent: 6212310 (2001-04-01), Waarts et al.
patent: 6434172 (2002-08-01), DiGiovanni et al.
patent: 6434301 (2002-08-01), Shin et al.
patent: 6768824 (2004-07-01), Ramachandran

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