Optical waveguides – Directional optical modulation within an optical waveguide – Light intensity dependent
Patent
1995-03-02
1996-03-19
Ullah, Akm E.
Optical waveguides
Directional optical modulation within an optical waveguide
Light intensity dependent
385 16, 359305, 356 731, G02F 1295, G02B 626
Patent
active
055009085
ABSTRACT:
The invention relates to an optical switch (1) which is switchable by means of light. The switch (1) comprises an optical wave-guiding structure (3) having an entrance (5) to which a signal can be applied and an exit (7). The refractive index of the wave-guiding structure (30) is variable by means of light intensity. The switch (1) further comprises a radiation source unit (15) whose radiation can be injected into the wave-guiding structure (3). The radiation source unit (15) comprises a pulsed laser (17) having a repetition time T and a pulse duration p and a medium (19) for transporting the radiation supplied by the laser (17). The radiation source unit (15) is provided with setting means (21 ) for stabilizing the wavelength of the laser (17) at a number n of selected wavelength bands from a number N of possibly selectable wavelength bands within one and the same pulse supplied by the laser (17). Moreover, the medium (19) is dispersive at a wavelength-dependent travel time t.sub.D in which the wavelength bands upon transport are separable in time as a result of dispersion.
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Liedenbaum Coen T. H. F.
Reid John J. E.
Balconi-Lamica Michael J.
U.S. Philips Corporation
Ullah Akm E.
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