Optical waveguides – With disengagable mechanical connector – Optical fiber to a nonfiber optical device connector
Patent
1991-03-21
1993-03-02
Lee, John D.
Optical waveguides
With disengagable mechanical connector
Optical fiber to a nonfiber optical device connector
385 93, G02B 642
Patent
active
051916290
ABSTRACT:
There is no problem to excite the fundamental mode in a single-mode optical waveguide, if a laser is used whose operating wavelength is above the cutoff wavelength of the guide. However, these lasers are presently very expensive.
Especially for the use in the subscriber area, where the relatively short transmission lengths allow to accept a certain amount of attenuation, it is proposed to use an inexpensive laser (6) whose operating wavelength, however, lies below the cutoff wavelength of the coupled optical waveguide (10). The excitation of only the fundamental mode is, according to the invention, possible with such a laser (6). A single-piece metallic module housing (1) is provided in which the laser (6), being moved perpendicularly to the module housing axis (1), is aligned to it by adjusting screws (12). A magnifying optic (9) is provided. The magnification causes a decrease of the angle at which the laser light reaches the face of the optical waveguide (10). The optical waveguide (10), being coaxially centered in a cylindrical bore (5), is adjusted axially to an optimal coupling and then fixed.
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ALCATEL N.V.
Lee John D.
Wise Robert E.
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