Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
1999-02-22
2001-06-12
Lee, John D. (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S024000, C385S065000, C385S083000, C359S199200, C359S199200
Reexamination Certificate
active
06246812
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to collimators for use with DWDM multiplexor or demultiplexor, and particularly to dual fiber collimators with V-groove positioning devices.
2. The Related Art
As well known, Dense-Wavelength-Divison-Multiplexing (DWDM) multiplexor or demultiplexor generally use the optical filter and the fiber optic collimators. In these applications, a band-pass optical filter is employed to multiplex or demultiplex a desired transmission channel of the in-and-out light of the system according to its center wavelength. An international standard wavelength grid has been suggested by International Telecommunication Union (ITU) for the center wavelengths of the DWDM channels. In the DWDM application, the center wavelength of the DWDM optical filter which does not coincide with the ITU standard wavelength, should be tuned to comply therewith. As the center wavelength of the band-pass optical filter depends upon the incident angle of the light that propagates therein, the center wavelength of the band-pass optical filter can be tuned by such an incident angle. The prior art generally uses an Y-branch structure of the three conventional fiber optic collimators wherein the incident angle is tuned by changing the angles between the collimators and thus the center wavelength of such a multiplexor/demultiplexor is adjustably coincident with the desired ITU wavelength. The disadvantage of such design includes difficulties in reducing its size to achieve a robust and compact structure. The related matters may be referred to U.S. Pat. Nos. 4,464,022, 5,204,771, 5,574,596 and 5,845,023, and “compact Polarization-Independent Optical Circulator”, Applied Optics, Vol. 20, No. 15, August 1981, pp. 2683-2687.
Therefore, it is desired to provide a collimator with means which can precisely and efficiently have the filter and the corresponding collimated beam with a required incident angle, thus assuring a desired ITU wavelength can be obtained.
SUMMARY OF THE INVENTION
According to an aspect of the invention, a V-groove dual fiber collimator including an optical lens and a V-groove dual fiber ferrule means fixed with each other. The ferrule means includes a V-groove chip and a cover chip commonly enclosed by a protective guiding sleeve wherein two pigtail fibers are respectively received within the corresponding grooves of the V-groove chip. The V-groove ferrule means is itself fixed by adhering its own internal components and the corresponding embedded fibers, and also fixed to the lens by adhesive.
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patent: 0123456 A2 (2000-01-01), None
Chang Peter C.
Liu Yuqiao
Alliance Fiber Optics Products, Inc.
Chung Wei Te
Doan Jennifer
Lee John D.
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