Tuning range extension by active mode-locking of external cavity laser including a linearly chirped fiber bragg grating
| Autor: | Olivier Durand, Joel Jacquet, Romain Brenot, Jean Landreau, Guang-Hua Duan, E. Gohin, Aurélien Bergonzo |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
business.industry Bandwidth (signal processing) Physics::Optics Grating Laser Atomic and Molecular Physics and Optics law.invention Wavelength Optics Mode-locking Fiber Bragg grating law Chirp Optoelectronics Physics::Atomic Physics Electrical and Electronic Engineering business Frequency modulation |
| Zdroj: | IEEE Journal of Selected Topics in Quantum Electronics. 9:1118-1123 |
| ISSN: | 1077-260X |
| DOI: | 10.1109/jstqe.2003.819519 |
| Popis: | We demonstrate electrical wavelength tuning by mode locking of an external cavity laser (ECL) with linearly chirped fiber Bragg grating (LCFBG). The configuration consists of a laser chip providing the gain coupled to an LCFBG with a large chip rate of 10 or 55 nm/cm providing the counter-reaction for laser oscillation. The laser chirp is electrically modulated by a sinusoidal signal in such a way that the ECL is mode locked. By changing the modulation frequency, a wavelength tuning range of 27 nm is achieved with the 10 nm/cm LCFBG, and a partial tuning range over 41 nm is demonstrated with the 55-nm/cm LCFBG. The output pulse stream at a specific mode-locking frequency and a corresponding wavelength is obtained for both positively and negatively chirped grating. A time bandwidth product reduction is measured in the case of negatively chirp grating when compared with positively chirp grating. A simple general law between the laser parameters is given (locking frequency, tuning range, and FBG chirp value). The parameters for a 40-nm tunable source modulated at 10 GHz are given. This simple tuning mechanism is very well adapted for a structure that requires accurate wavelength monitoring. |
| Databáze: | OpenAIRE |
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