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Opt Lett. 2009 Oct 15;34(20):3116-8. doi: 10.1364/OL.34.003116.

Terahertz-bandwidth high-order temporal differentiators based on phase-shifted long-period fiber gratings.

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Institute of Photonics and Electronics Academy of Sciences of the Czech Republic, Chaberská 57, Prague 182 51, Czech Republic.


We report the fabrication of a pi-phase-shifted long-period fiber grating (LPFG) capable of operating as a terahertz-bandwidth second-order temporal differentiator. We demonstrate its operation experimentally by differentiating subpicosecond long optical pulses. A new scheme for achieving high-order photonic temporal differentiation based on LPFG filters is also proposed and demonstrated. In particular, we prepared a LPFG-based first-order differentiator that was frequency and bandwidth matched to the second-order device and demonstrated the cascadability of these devices leading to the implementation of a third-order differentiator. By also employing these devices in reflection, up to the fifth-order differentiation is demonstrated experimentally.


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