16  MHz wavelength-swept and wavelength-stepped laser architectures based on stretched-pulse active mode locking with a single continuously chirped fiber Bragg grating

Optics Letters
Reza KhazaeinezhadBenjamin J Vakoc

Abstract

We demonstrate a novel high-speed and broadband laser architecture based on stretched pulse active mode locking that provides a wavelength-swept and wavelength-stepped output. The laser utilizes a single intracavity 8.3 meter chirped fiber Bragg grating to generate positive and negative dispersion, and can be operated with or without an intracavity fixed Fabry-Perot etalon to generate wavelength-swept and wavelength-stepped (frequency comb) outputs, respectively. Using a four-path delay line at the output, we achieved 16.3 MHz repetition rates and a 62 nm lasing bandwidth centered at 1550 nm. Single-sided double-pass coherence lengths of 1.25 mm for the wavelength-swept configuration and more than 30 mm for the wavelength-stepped configuration were obtained. Relative intensity noise was measured to be better than -140  dB/Hz. The stretched-pulse mode-locked architecture utilizing long chirped fiber Bragg gratings offers a simple and compact design for a broadband wavelength-tuned output at unprecedented speeds, and can address the need for fast sources in applications such as optical ranging, imaging, and sensing.

References

Jun 11, 2008·Optics Express·Shinwook LeePeter J Delfyett
Jun 10, 2009·Optics Express·Benjamin R BiedermannRobert Huber
Oct 2, 2006·Optics Express·Shinji Yamashita, Masahiro Asano
Jul 20, 1991·Applied Optics·B L Danielson, C Y Boisrobert
Mar 23, 2013·Electronics Letters·V JayaramanA Cable

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