Low cost optical module
View Patent ↗The present invention comprises an optical module, passively aligned and used in high-speed optical communication systems, having a ferrule disposed in an aperture in an upper plate of the module. The ferrule protrudes a predetermined distance through the aperture in order to guarantee butt coupling of an optical fibre to an active optical component disposed at a predetermined height on a lower plate of the module.
1. A method of passively aligning a high-speed optical module, said method comprising the steps of:
disposing a ferrule within an aperture of an upper plate at a predetermined distance from said upper plate,
disposing at least one active high speed optical component on a lower plate at a predetermined height above an upper surface of said lower plate, wherein said predetermined distance and said predetermined height are such that efficient optical coupling in the axial direction is achieved between a fibre disposed within said ferrule and said at least one active high speed optical component,
visually aligning said upper plate with respect to said lower plate using overlapping images of the fibre and the at least one high speed optical component such that efficient optical coupling in the planar direction is achieved between said fibre disposed within said ferrule and said at least one active high speed optical component, and
sealing said upper plate to said lower plate.
2. The method of claim 1 , wherein said upper plate or said lower plate is ceramic.
3. The method of claim 1 , wherein said at least one active optical component is flip chip mounted on said upper surface of said lower plate.
4. The method of claim 1 , wherein said at least one active optical component is a detector.
5. The method of claim 4 , wherein said detector is a PIN detector
6. The method of claim 4 , wherein said detector is an avalanche detector.
7. The method of claim 1 , wherein said module is an optical receiver.
8. The method of claim 1 , wherein said at least one active optical component is a light source.
9. The method of claim 8 , wherein said light source is a laser.
10. The method of claim 9 , wherein said laser is a vertical cavity surface emitting laser.
11. The method of claim 1 , wherein said module is an optical transmitter.
12. The method of claim 1 , wherein said upper and lower plates are hermetically sealed.
13. The method of claim 1 , wherein said module further comprises an electrical connector disposed on said lower plate.
14. The method of claim 13 , wherein said electrical connector is a flex connector.
15. The method of claim 13 , wherein said electrical connector is a series of electrical lead connectors.