Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Photonik II

Q 58.4: Talk

Thursday, March 22, 2007, 14:45–15:00, 5J

Brillouin scattering in hollow core photonic bandgap fibers — •Erik Benkler and Harald R. Telle — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig

Stimulated Brillouin scattering limits the high power transmission capability of narrowband cw and quasi-cw signals in optical fibers. Recently developed hollow core photonic bandgap (HC-PBG) fibers, however, promise a much lower Brillouin scattering cross section than conventional fibers due to strongly reduced overlapping between light field and guiding structure.

We have measured the Brillouin gain spectrum of commercially available HC-PBG fibers employing a novel highly sensitive scheme. Two frequency modulated DFB laser diodes are used as pump and Stokes sources. The resulting AM component of the Brillouin signal is lock-in detected at the difference of the two modulation frequencies.

Using excitation wavelengths in the telecommunication band, we found spectra at Brillouin shifts around 7.5 GHz which are substantially more complex and at least 4 orders of magnitude smaller than those of standard telecom fibers.