Photonetics

Bertrand Merigot

Philippe Martin

Bernard Laloux

Herve Lefevre

Herv&eacute; Lefevre

Denis Mangeot

Herv&euml; Lefevre

Herve Lefervre

Optical fiber wavelength, multiplexer and demultiplexer

Optical wave-guide wavelength multiplexer and demultiplexer

The present invention relates to an optical fiber wavelength multiplexing or demultiplexing device comprising. The multiplexer comprises input fibers (101 to 105) designed for carrying luminous beams at different wavelengths (.lambda.1, .lambda.2, . . . , .lambda.n), an output fiber (161) designed for carrying the whole set of such luminous beams, a dispersing system (107) receiving luminous beams from the input fibers (101 to 105) in an input plane and generating superimposed luminous beams designed for the output fiber (161) in an output plane. A converging lens array (171 to 175) is located in the input plane, whereas a lens corresponds to each input fiber and whereby the said input fiber is placed in the focal point of the said lens. The demultiplexer comprises the same elements, whereas the roles of the fibers and input/ouput planes are reversed.

Optical fiber wavelength multiplexer and demutiplexer

The invention relates to an optical spectrum analyzer of an incident light beam (101) and a process for analyzing the corresponding spectrum. The spectrum analyzer comprises addressing means (1), a diffraction grating (2), a reflecting dihedron (3), a device (4) for adjusting the rotation of the reflecting dihedron and reception means (5). A polarization separator (11) divides the incident beam (101) into a first and second parallel secondary beam (102, 104), of linearly polarized light along the directions parallel to and perpendicular to the grooves in the grating respectively, and a .lambda./2 plate (12) placed on the path of the first secondary beam (102) applies a perpendicular polarization direction to this beam. The grating diffracts the secondary beams (103, 104) a first time, the reflecting dihedron exchanges their directions, the grating diffracts them a second time, the .lambda./2 plate applies a 90.degree. rotation to the polarization state of the second secondary beam (110) and the separator recombines the secondary beams (109, 111) into a single main beam (112) returned to reception means.

Optical spectrum analyzer and process for analyzing the corresponding

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Paris, France

Bertrand Merigot