Phase-control in an external-cavity tuneable laser

Details Phase-control in an external-cavity tuneable laser Phase-control in an external-cavity tuneable laser

H - Electricity

01

S

H01S 5/14 (2006.01)

Patent

CA 2540600

The present invention relates to a single-mode external-cavity tuneable laser including a gain medium, a tuneable element and a channel allocation grid element. The channel allocation grid element is preferably a FP etalon, which is structured and configured to define a plurality of equally spaced transmission peaks corresponding to the ITU channel grid, e.g., 200, 100, 50 or 25 GHz. The tuneable element, preferably a tuneable mirror, serves as the coarse tuning element that discriminates between the peaks of the grid etalon. The tuneable laser of the invention has a relatively short cavity length of not more than 15 mm, preferably not larger than 12 mm. It has been found that the FP etalon introduces a phase non-linearity in the external cavity, which induces a compression of the cavity modes, i.e., a reduction in the cavity mode spacing, in correspondence to the etalon transmission peaks. Mode compression increases with the decrease of the FWHM bandwidth of the grid FP etalon, hereafter referred to as (FWHM)FP. (FWHM)FP should be comprised in the range from about 2 GHz to about 8 GHz. Preferably, (FWHM)FP is comprised between approximately 3 and 6 GHz.

La présente invention concerne un laser accordable monomodal à cavité externe comprenant un support de gain, un élément accordable et un élément de grille pour attribution de canal. Ladite grille est de préférence un étalon Fabry Perot (FP), lequel est structuré et conçu pour définir une pluralité de pics d'émission équidistants correspondant à la grille de canal ITU, soit 200, 100, 50 ou 25 GHz. L'élément accordable, de préférence un miroir accordable, fait office d'élément d'accordage grossier faisant une distinction entre les pics de l'étalon à grille. Le laser accordable de l'invention présente une longueur de cavité relativement faible ne dépassant pas 15 mm, de préférence ne dépassant pas 12 mm. On a constaté que l'étalon FP introduisait une non linéarité de phase dans la cavité externe qui induisait une compression des modes cavité, c'est-à-dire une diminution de l'espacement entre modes cavités, correspondant aux pics d'émission de l'étalon. La compression de mode augmente lorsque diminue la largeur de bande FWHM de l'étalon FB dite (FWHM)<SB>FP </SB>ci-après. (FWHM)<SB>FP</SB> doit être compris entre 2 GHz et 8 GHz environ, de préférence entre quelque 3 et quelque 6 GHz.

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