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A novel frequency-offset monitoring technique for direct-detection DPSK systems

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5 Author(s)
Ji, H.-C. ; Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Park, P.K.J. ; Hoon Kim ; Lee, J.H.
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We propose and demonstrate a novel technique to monitor the frequency offset between the optical source and delay interferometer (DI) for direct-detection differential phase-shift-keying (DPSK) systems. In this scheme, a phase-modulated tone is applied to DPSK signals at the transmitter and then detected after being converted into an amplitude-modulated tone at the DI to be used for the monitoring signal. Our experimental demonstration shows that the monitoring range and sensitivity of the proposed scheme are measured to be ±2 GHz and ∼10 MHz, respectively, which we believe are good enough to be used either to generate alarm signals for the frequency offset monitoring or to control the feedback loop of the DI.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 8 )