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Ideal phase-locked-loop (PLL) operation of a 10 GHz erbium-doped fibre laser using regenerative modelocking as an optical voltage controlled oscillator

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3 Author(s)
Nakazawa, M. ; Optical Soliton Commun. Res. Group, NTT Access Network Syst. Labs., Ibaraki, Japan ; Yoshida, E. ; Tamura, K.

Ideal phase-locked-loop (PLL) operation of a 10 GHz erbium doped fibre laser has been achieved for the first time by using a voltage controlled regenerative modelocking technique. The repetition rate of the regeneratively modelocked fibre laser in a free running condition can be continuously varied by changing the voltage supplied to the PZT to change the fibre cavity length. PLL operation is achieved by feeding back a phase sensitive error signal to the PZT. This signal is obtained by mixing a laser clock signal with a synthesizer signal. The external signal tracking range is 40 kHz

Published in:

Electronics Letters  (Volume:33 ,  Issue: 15 )