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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 717–726

Etched beam splitters in InP/InGaAsP

Erik J. Norberg, John S. Parker, Steven C. Nicholes, Byungchae Kim, Uppiliappan Krishnamachari, and Larry A. Coldren  »View Author Affiliations

Optics Express, Vol. 19, Issue 2, pp. 717-726 (2011)

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An etched beam splitter (EBS) photonic coupler based on frustrated total internal reflection (FTIR) is designed, fabricated and characterized in the InP/InGaAsP material system. The EBS offers an ultra compact footprint (8x11 μm) and a complete range of bar/cross coupling ratio designs. A novel pre-etching process is developed to achieve sufficient depth of the etched coupling gaps. Fabricated EBS couplers demonstrate insertion loss between 1 and 2.6 dB with transmission (cross-coupling) 10%. The results show excellent agreement with 3D finite-difference time-domain (FDTD) modeling. The coupling of EBS has weak wavelength dependence in the C-band, making it suitable for wavelength division multiplexing (WDM) or other wide bandwidth applications. Finally, the EBS is integrated with active semiconductor optical amplifier (SOA) and phase-modulator components; using a flattened ring resonator structure, a channelizing filter tunable in both amplitude and center frequency is demonstrated, as well as an EBS coupled ring laser.

© 2011 OSA

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(230.1360) Optical devices : Beam splitters
(230.5750) Optical devices : Resonators
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Integrated Optics

Original Manuscript: October 26, 2010
Revised Manuscript: December 17, 2010
Manuscript Accepted: December 22, 2010
Published: January 5, 2011

Erik J. Norberg, John S. Parker, Steven C. Nicholes, Byungchae Kim, Uppiliappan Krishnamachari, and Larry A. Coldren, "Etched beam splitters in InP/InGaAsP," Opt. Express 19, 717-726 (2011)

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