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Proceedings Paper

Design of taper coupler for effective laser and single mode fiber coupling with large tolerance
Author(s): Jing Zhang; V. Ramana Pamidighantam; John Hon-Shing Lau; Qingxin Zhang; Chandrappan Jayakrishnan; Chee Wei Tan; Ming Chinq Jong; Teo Wei Liang Calvin; Dim Lee Kwong
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Paper Abstract

A new method of coupling the light from a laser diode to a Single Mode Fiber (SMF) with large alignment tolerances and without using coupling lenses is presented. A pseudo vertical tapered coupler is designed for light coupling between laser diode and single mode fiber. It has a large input aperture which is about 100 times the size of the laser waveguide cross-section. The tapered coupler provides single mode output and matches the mode size with the single mode fiber. The tapered coupler is fabricated on a silicon optical bench and is located between the laser and the fiber through the silicon micrfabrication process. The misalignment between the fiber and taper coupler can be very small since this is controlled by high precision silicon optical bench patterning processes. The coupler relaxes the laser diode placement accuracies and eliminates the need for a coupling lens. Design Studies showed that the tolerance between the laser diode and taper coupler can be more than +/-5μm misalignment at x-y, and +/-0.5degree tilting angle tolerance and the fabricated assembly results are encouraging with good placement tolerances and coupling efficiency. The laser to single mode fiber coupling tolerances is greatly improved and passive alignment for laser and single mode fiber is realized. The technology can be useful for multi channel optical assembly where significant device and process cost saving can be achieved and is suitable for functional integration for silicon photonics.

Paper Details

Date Published: 12 December 2007
PDF: 8 pages
Proc. SPIE 6782, Optoelectronic Materials and Devices II, 67821L (12 December 2007); doi: 10.1117/12.746624
Show Author Affiliations
Jing Zhang, Institute of Microelectronics (Singapore)
V. Ramana Pamidighantam, Institute of Microelectronics (Singapore)
John Hon-Shing Lau, Institute of Microelectronics (Singapore)
Qingxin Zhang, Institute of Microelectronics (Singapore)
Chandrappan Jayakrishnan, Institute of Microelectronics (Singapore)
Chee Wei Tan, Institute of Microelectronics (Singapore)
Ming Chinq Jong, Institute of Microelectronics (Singapore)
Teo Wei Liang Calvin, Institute of Microelectronics (Singapore)
Dim Lee Kwong, Institute of Microelectronics (Singapore)

Published in SPIE Proceedings Vol. 6782:
Optoelectronic Materials and Devices II
Yoshiaki Nakano, Editor(s)

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