Please use this identifier to cite or link to this item: https://doi.org/10.1117/12.764254
Title: Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance
Authors: Jing, Z.
Bihan, L.
Chandrappan, J.
Xin, Z.Q.
Ramana, P.V.
Prabhathan, P.
Shing, L.H.
Lee, K.D. 
Matham, M.V.
Keywords: Coupling efficiency
Laser diode attachment
Silicon waveguide
Taper coupler
Tolerance
Issue Date: 2008
Source: Jing, Z., Bihan, L., Chandrappan, J., Xin, Z.Q., Ramana, P.V., Prabhathan, P., Shing, L.H., Lee, K.D., Matham, M.V. (2008). Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance. Proceedings of SPIE - The International Society for Optical Engineering 6899 : -. ScholarBank@NUS Repository. https://doi.org/10.1117/12.764254
Abstract: A taper coupler with multimode input and single mode output is presented for coupling between edge emitting laser diode and silicon waveguide. The tapered coupler structure is optimized and tolerance for laser diode placement is studied. A typical coupling efficiency of -2dB is achieved from laser diode to silicon waveguide. With tolerance of +/- 4μim laterally or vertically, the variation of the coupling efficiency is about 3dB. The tolerance is large compared with other methods. Tilting angle at laser diode and the small gap between tapered coupler and silicon waveguide also affect the overall coupling. From our studies, horizontal and vertical offsets are more critical for laser diode placement in order to have a good coupling. The new design can be applied to photonics packaging because it will make passive assembly easier by having larger tolerance for packaging compared with the conventional method with lens.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/130476
ISBN: 9780819470744
ISSN: 0277786X
DOI: 10.1117/12.764254
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