Strongly confined polarization-independent single-mode...

G - Physics – 02 – B

Patent

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G02B 6/12 (2006.01) G02B 6/125 (2006.01)

Patent

CA 2399701

A strongly confined ridge waveguide that provides substantially reduced polyrization sensitivity, without significant compromise for other waveguide characteristics such as, for example, single-mode condition, and low propagation and bending losses for the fundamental mode. The present invention considers waveguide material composition and thickness for guiding and cladding layers, bend radius, ridge width and etch depth at which the modal indices of the fundamental TE and TM modes are equal. With those parameters, the losses (e.g., the imaginary parts of the modal indices) of the fundamental and first-order modes may be calculated. By considering the previously mentioned criteria, a low-loss, single-mode ridge waveguide may be constructed in accordance with the present invention having losses of the fundamental modes in the range of less than approximately 1.0 dB/mm, and losses of higher- order modes in the range of greater than approximately 10 dB/mm (thus providing a loss difference of at least approximately 10 dB/mm).

Ce guide d'onde à moulure, très confiné, possède une sensibilité sensiblement réduite à la polarisation sans pour autant perdre ses autres caractéristiques de guide d'onde, telles que, par exemple, l'état monomodal, et la faible propagation et les pertes par flexion, pour ce mode fondamental. L'invention concerne une composition de matériau de guide d'onde, ainsi que l'épaisseur de la couche guide et des couches gaines, le rayon de flexion, la largeur de moulure et la profondeur de gravure, lesquels permettent aux indices de réfraction des modes fondamentaux TE (transversal électrique) et TM (transversal magnétique) d'être égaux. A l'aide de ces paramètres, il est possible de calculer les pertes (par exemple les parties imaginaires des indices de réfraction) des modes fondamentaux et de premier ordre. En tenant compte des critères précédemment mentionnés, on peut construire un guide d'onde à moulure, monomodal, à faibles pertes, selon l'invention, ce guide possédant des pertes de modes fondamentaux se situant dans une plage inférieure à approximativement 1,0 dB/mm, ainsi que des pertes de modes d'ordre supérieur se situant dans une plage supérieure à approximativement 10 dB/mm (la différence de perte étant d'approximativement 10 dB/mm, au moins).

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