Current Optics and Photonics

Optical Society of Korea (한국광학회)
권호 표지
DOI QR코드

DOI QR Code

Spectral-shape-controllable Chirped Fiber Bragg Grating with a Photomechanical Microactuator: Simulation and Experiment

  • Moon, Jong-Ju (Department of Photonic Engineering, Chosun University) ;
  • Ko, Youngmin (Department of Photonic Engineering, Chosun University) ;
  • Park, Su-Jeong (Department of Photonic Engineering, Chosun University) ;
  • Ahn, Tae-Jung (Department of Photonic Engineering, Chosun University)
  • Received : 2020.08.15
  • Accepted : 2020.10.28
  • Published : 2020.12.25
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, one of the authors has been reported an optically tunable fiber Bragg grating (FBG) with a photomechanical polymer. It was based on a typical FBG with a downsized diameter of 60 ㎛, coated with azobenzene-containing polymer material. Azobenzene is a well-known reversibly photomechanical stretchable material under ultraviolet (UV) light. The small part of the functional-coating region on the FBG absorbed UV light, which pulled the UV-exposed part of the grating. It was selectable as tunable FBG or tunable chirped FBG, by adjusting the position of UV exposure on the grating. As proof of concept for the tunable FBG device, the characteristics just including UV-induced center-wavelength shift and spectral-width changes of the device were reported. In this paper, we report for the first time that the microactuator makes it possible to control the spectral shape of the FBG reflection, according to the specifications (shape and intensity) of the UV beam that reaches the FBG coated with the azobenzene polymer. In addition, we provide the group-delay profiles for the chirped FBG, so that the sign of its dispersion (normal or anomalous) can be tailored by simply selecting the moving direction of the UV light's displacement in the experiment.

Keywords

References

  1. A. Othonos and K. Kalli, Fiber Bragg grating: Fundamentals and Applications in Telecommunications and Sensing (Artech House Print on Demand, MA, USA, 1999).
  2. G.-S. Seo and T.-J. Ahn, "Protection method for diameter-downsized fiber Bragg gratings for highly sensitive ultra-violet light sensors," Curr. Opt. Photon. 2, 221-225 (2018). https://doi.org/10.3807/COPP.2018.2.3.221
  3. R. Kashyap, "Chirped fibre Bragg gratings for WDM applications," in Optical Amplifiers and Their Applications (Optical Society of America, 1997), paper FAW12.
  4. D. Tosi, "Review of chirped fiber Bragg grating (CFBG) fiber-optic sensors and their applications," Sensors 18, 2147 (2018). https://doi.org/10.3390/s18072147
  5. M. Buric, J. Falk, K. P. Chen, L. Cashdollar, and A. Elyamani, "Piezo-electric tunable fiber Bragg grating diode laser for chemical sensing using wavelength modulation spectroscopy," Opt. Express 14, 2178-2183 (2006). https://doi.org/10.1364/OE.14.002178
  6. H. A. Fayed, M. Mahmoud, A. K. A. Seoud, and M. H. Aly, "Magnetically tunable fiber Bragg grating supported by guiding mechanism system," Proc. SPIE 7750, 77501Z (2010).
  7. Z. Li, V. K. S. Hsiao, Z. Chen, J. Y. Tang, F. L. Zhao, and H. Z. Wang, "Optically tunable fiber Bragg grating," IEEE Photon. Technol. Lett. 22, 1123-1125 (2010). https://doi.org/10.1109/LPT.2010.2049738
  8. Z. Li, Z. Chen, V. K. S. Hsiao, J.-Y. Tang, F. Zhao, and S.-J. Jiang, "Optically tunable chirped fiber Bragg grating," Opt. Express 20, 10827-10832 (2012). https://doi.org/10.1364/OE.20.010827
  9. T.-J. Ahn and S. Moon, "Optically tunable fiber Bragg grating based on a photo-mechanical tuning mechanism," Opt. Lett. 44, 2546-2549 (2019). https://doi.org/10.1364/OL.44.002546
  10. E. W.-G. Diau, "A new trans-to-cis photoisomerization mechanism of azobenzene on the S1(n, π*) Surface," J. Phys. Chem. A. 108, 950-956 (2004). https://doi.org/10.1021/jp031149a
  11. K. G. Yager and C. J. Barrett, "Azobenzene polymers as photomechanical and multifunctional smart materials," in Intelligent Materials, M. Shahinpoor and H.-J. Schneider, eds. (Royal Society of Chemistry, UK, 2008), Chapter 17.
  12. I.-S. Song, W.-Y. Kim, C.-Y. Kim, B. H. Kim, H.-K. Kim, and T.-J. Ahn, "Sensitivity enhancement of a UV photo-sensor based on a fiber Bragg grating coated by a photo-mechanical functional polymer," Sens. Act. A 232, 223-228 (2015). https://doi.org/10.1016/j.sna.2015.06.013
  13. G.-S. Seo, H.-T. Cho, O.-R. Lim, and T.-J. Ahn, "Highly sensitive and fact UV sensor based on fiber grating with easily producible photoreactive material," Sens. Act. A 283, 169-173 (2018). https://doi.org/10.1016/j.sna.2018.09.056
  14. Y. Park, T.-J. Ahn, J.-C. Kieffer, and J. Azana, "Optical frequency domain reflectometry based on real-time fourier transformation," Opt. Express 15, 4597-4616 (2007). https://doi.org/10.1364/OE.15.004597