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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 23809–23817

Giant tunable optical dispersion using chromo-modal excitation of a multimode waveguide

Eric D. Diebold, Nick K. Hon, Zhongwei Tan, Jason Chou, Todd Sienicki, Chao Wang, and Bahram Jalali  »View Author Affiliations

Optics Express, Vol. 19, Issue 24, pp. 23809-23817 (2011)

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The ability to control chromatic dispersion is paramount in applications where the optical pulsewidth is critical, such as chirped pulse amplification and fiber optic communications. Typically, devices used to generate large amounts (>100 ps/nm) of chromatic dispersion are based on diffraction gratings, chirped fiber Bragg gratings, or dispersion compensating fiber. Unfortunately, these dispersive elements suffer from one or more of the following restrictions: (i) limited operational bandwidth, (ii) limited total dispersion, (iii) low peak power handling, or (iv) large spatial footprint. Here, we introduce a new type of tunable dispersive device, which overcomes these limitations by leveraging the large modal dispersion of a multimode waveguide in combination with the angular dispersion of diffraction gratings to create chromatic dispersion. We characterize the device’s dispersion, and demonstrate its ability to stretch a sub-picosecond optical pulse to nearly 2 nanoseconds in 20 meters of multimode optical fiber. Using this device, we also demonstrate single-shot, time-wavelength atomic absorption spectroscopy at a repetition rate of 90.8 MHz.

© 2011 OSA

OCIS Codes
(230.7370) Optical devices : Waveguides
(260.2030) Physical optics : Dispersion
(300.6530) Spectroscopy : Spectroscopy, ultrafast
(320.7150) Ultrafast optics : Ultrafast spectroscopy
(320.7160) Ultrafast optics : Ultrafast technology
(130.2035) Integrated optics : Dispersion compensation devices

ToC Category:
Ultrafast Optics

Original Manuscript: September 26, 2011
Revised Manuscript: October 21, 2011
Manuscript Accepted: October 23, 2011
Published: November 8, 2011

Eric D. Diebold, Nick K. Hon, Zhongwei Tan, Jason Chou, Todd Sienicki, Chao Wang, and Bahram Jalali, "Giant tunable optical dispersion using chromo-modal excitation of a multimode waveguide," Opt. Express 19, 23809-23817 (2011)

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