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Proceedings Paper

Design of a 1550nm SiGe/Si quantum-well optical modulator
Author(s): Tania Tasmin; Nicolas Rouger; Guangrui Xia; Lukas Chrostowski; Nicolas A. F. Jaeger
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Paper Abstract

An electrooptic modulator containing a single SiGe/Si quantum-well has been designed for operation at λO= 1.55 μm. This single quantum-well modulator has a lower VπLπ than the 3 quantum-well modulator recently designed and optimized by Maine et al. for operation at λO = 1.31 μm, for which the VπLπ product was 1.8 V · cm. This single quantum-well modulator contains a Si0.8Ge0.2 quantum-well with Non-Intentionally Doped (NID) and P+ highly doped layers on either side. With no field applied, holes from the P+ layers are captured by and confined in the quantum-well and when a reverse bias is applied holes are released from the quantum well and drift to the P+ contact layer. Variations of the hole distribution lead to changes in the free-carrier absorption and the refractive index of each layer and subsequently to phase modulation of guided TE modes. The VπLπ product of the single quantum-well modulator is estimated 1.09 V · cm for low voltage linear modulation and 1.208 V · cm for 0 to 1.6 V digital modulation, whereas the 3 quantum-well modulator gives a VπLπ of 2.039 V · cm for 0 to 6 V digital modulation for operation at λO = 1.55 μm. Also, the optical loss in the single quantum-well (5.36 dB/cm at V = 0 V ) is lower than that of the 3 quantum-well structure (5.75 dB/cm at V = 0 V ). This single quantum-well modulator should also offer higher frequency operation than the 3 quantum-well modulator.

Paper Details

Date Published: 23 September 2010
PDF: 10 pages
Proc. SPIE 7750, Photonics North 2010, 77501N (23 September 2010); doi: 10.1117/12.870014
Show Author Affiliations
Tania Tasmin, The Univ. of British Columbia (Canada)
Nicolas Rouger, Grenoble Univ. (France)
Guangrui Xia, The Univ. of British Columbia (Canada)
Lukas Chrostowski, The Univ. of British Columbia (Canada)
Nicolas A. F. Jaeger, The Univ. of British Columbia (Canada)


Published in SPIE Proceedings Vol. 7750:
Photonics North 2010

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