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Vol. 226, Issue 10, October 2018, pp. 10-16




Doubled Repetition Frequency in Regeneratively and Harmonically Mode-Locked Fiber Ring Laser


Department of Electrical Engineering, Graduate School of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 2788510 Japan
* Tel: +81(0)471229547, fax: +81(0)471258651

* E-mail: joji.maeda@rs.tus.ac.jp


Received: 25 June 2018 /Accepted: 31 August 2018 /Published: 31 October 2018

Digital Sensors and Sensor Sysstems


Abstract: A regeneratively and harmonically mode-locked fiber ring laser that generated a pulse train with a doubled repetition frequency was experimentally demonstrated. We used a polarization-maintaining fiber laser and an electrical circuit that extracted a subharmonic clock to produce self-pulsing with a repetition frequency of 21.32 GHz while extracting the electrical clock at 10.66 GHz. The mode of operation depended on the bias point of the optical modulator. The doubled repetition frequency was observed when the modulator was biased in the vicinity of the voltage providing either the maximum or minimum transmission. Otherwise, the repetition frequency coincided with the modulation frequency. Detailed analyses of repetition frequencies suggested that the frequency-doubled pulse generation could be caused by rational harmonic mode-locking.


Keywords: Pulse lasers, Fiber lasers, Active mode-locking, Harmonic mode-locking, Rational harmonic mode-locking, Semiconductor optical amplifier, Clock extraction.


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