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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 9213–9219

Gain analysis of optically-pumped Si nanocrystal waveguide amplifiers on silicon substrate

Gong-Ru Lin, Cheng-Wei Lian, Chung-Lun Wu, and Yung-Hsiang Lin  »View Author Affiliations

Optics Express, Vol. 18, Issue 9, pp. 9213-9219 (2010)

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The SiO2/SiOx/SiO2 strip-loaded waveguide on Si substrate with buried Si nanocrystals (Si-ncs) in SiOx layer is demonstrated to show the Si-nc dependent optical gain. The amplified spontaneous emission (ASE) spectrum at 750-850 nm is observed with central wavelength of 805 nm and 3dB spectral linewidth of 140 nm. The optical net modal gain and loss coefficients of 85.7 cm−1 and 21 cm−1, respectively, are determined from the waveguide length dependent ASE intensity. By attenuating 785-nm laser diode signal to inject the pumped SiO2/SiOx/SiO2 strip-loaded waveguide, a small-signal power gain of 13.5 decibel (dB) is obtained. Increasing the laser diode power shows a significantly reduced power gain with a saturated output power due to the finite density of the optically pumped Si-ncs. The fitting of power-dependent gain with a gain-saturated amplifier model reveals a peak gain of 35 dB and a saturation power of 1.1 nW for the SiO2/SiOx:Si-nc/SiO2/Si strip-loaded waveguide. Similar output saturation is also observed with increasing pumping power. With the presence of optical gain in the optically pumped Si-ncs, the intended application will be the monolithic integration of the Si-nc based optical waveguide amplifier with the other on-board photonic integrated circuits for the future optical interconnect communication.

© 2010 OSA

OCIS Codes
(130.5990) Integrated optics : Semiconductors
(140.4480) Lasers and laser optics : Optical amplifiers
(230.7370) Optical devices : Waveguides
(160.4236) Materials : Nanomaterials

ToC Category:
Optical Devices

Original Manuscript: February 26, 2010
Revised Manuscript: March 15, 2010
Manuscript Accepted: March 15, 2010
Published: April 16, 2010

Gong-Ru Lin, Cheng-Wei Lian, Chung-Lun Wu, and Yung-Hsiang Lin, "Gain analysis of optically-pumped Si nanocrystal waveguide amplifiers on silicon substrate," Opt. Express 18, 9213-9219 (2010)

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