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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 15 — Jul. 21, 2008
  • pp: 11470–11480

Broadband directional couplers fabricated in bulk glass with high repetition rate femtosecond laser pulses

Wei-Jen Chen, Shane M. Eaton, Haibin Zhang, and Peter R. Herman  »View Author Affiliations

Optics Express, Vol. 16, Issue 15, pp. 11470-11480 (2008)

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A femtosecond fiber laser was applied to fabricate broadband directional couplers inside bulk glass for general power splitting application in the 1250 to 1650-nm wavelength telecom spectrum. The broadband response was optimized over the 400-nm bandwidth by tailoring the coupling strength and the waveguide interaction length to balance the differing wavelength dependence of the straight interaction and bent transition regions. High spatial finesse of the femtosecond-laser writing technique enabled close placement (~6 μm) of adjacent waveguides that underpinned the wavelength-flattened broadband response at any coupling ratio in the 0% to 100% range. The spectral responses were well-represented by coupled mode theory, permitting simple design and implementation of broadband couplers for bulk 3D optical circuit integration.

© 2008 Optical Society of America

OCIS Codes
(230.1360) Optical devices : Beam splitters
(230.7370) Optical devices : Waveguides
(250.5300) Optoelectronics : Photonic integrated circuits
(320.2250) Ultrafast optics : Femtosecond phenomena
(350.3390) Other areas of optics : Laser materials processing
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Optical Devices

Original Manuscript: June 23, 2008
Revised Manuscript: July 14, 2008
Manuscript Accepted: July 15, 2008
Published: July 16, 2008

Wei-Jen Chen, Shane M. Eaton, Haibin Zhang, and Peter R. Herman, "Broadband directional couplers fabricated in bulk glass with high repetition rate femtosecond laser pulses," Opt. Express 16, 11470-11480 (2008)

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