Optical modulators as monolithically integrated optical...

H - Electricity – 04 – B

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H04B 10/04 (2006.01) G02F 1/01 (2006.01) H01S 3/00 (2006.01) H01S 5/0625 (2006.01) G02F 1/025 (2006.01) H01S 5/026 (2006.01)

Patent

CA 2128839

- 24 - OPTICAL MODULATORS AS MONOLITHICALLY INTEGRATED OPTICAL ISOLATORS Abstract An apparatus and technique for providing isolation for a signal source utilizing two or more modulators is described. In particular, the apparatus generates a timed sequence of "open gates" that are synchronized to the data signal which permit transmission in a forward direction, and which attenuate a reverse direction signal. Another embodiment attenuates primarily reflected light signals by utilizing a passive waveguide and a modulator. The passive waveguide provides a propagation delay such that signals reflected from its end facet are attenuated by the modulator. The apparatus is suitable for use as an isolator for a light source in a high-speed optical fiber data transmission system.

MODULATEURS OPTIQUES SERVANT D'ISOLATEURS OPTIQUES INTEGRES MONOLITHIQUEMENT L'invention est constituée par un appareil et une méthode utilisant deux modulateurs ou plus pour isoler une source de signaux. En particulier, l'appareil de l'invention produit une suite d'états de transmission dans le sens direct et d'affaiblissement dans le sens inverse qui sont ordonnés temporellement et synchronisés avec le signal de données. Dans une autre concrétisation de l'invention, les signaux lumineux réfléchis sont affaiblis par un guide de lumière passif et un modulateur. Ce guide de lumière produit un retard de propagation tel que les signaux réfléchis par sa facette terminale sont affaiblis par le modulateur. L'appareil de l'invention peut être utilisé comme isolateur pour source lumineuse de système de transmission rapide de données à fibres optiques.

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