Dither-free low-bias controller for deeply modulated Mach-Zehnder modulators

Dither-free low-bias controller for deeply modulated Mach-Zehnder modulators Stable bias control of lithium niobate Mach-Zehnder modulator (MZM) is crucial for radio-over-fiber (ROF) links, since the bias drift causes deviation from the optimum operating point. In this paper, we propose and experimentally demonstrate a novel dither-free low-bias control technique, especially for deeply modulated, low-biased analog photonic links. In our scheme, a second lightwave passes through the MZM, while the output power is locked. Since the reverse modulation efficiency is very low when the input radio frequency (RF) carrier is as high as GHz, the RF power shows little impact on the optical power even when the bias angle is very low, so that the bias stabilization is achieved. Experiment results show that bias locking at a low-bias position (about $$-81^{\circ }$$ - 81 ∘ ) with phase deviations less than $$\pm 2.6^{\circ }$$ ± 2 . 6 ∘ is achieved even when the input RF voltage is as high as $$1.3 \,V_{\pi }$$ 1.3 V π . Our proposal needs no low-frequency dither, which is promising for ROF links. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Photonic Network Communications Springer Journals

Dither-free low-bias controller for deeply modulated Mach-Zehnder modulators

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Publisher
Springer US
Copyright
Copyright © 2016 by Springer Science+Business Media New York
Subject
Computer Science; Computer Communication Networks; Electrical Engineering; Characterization and Evaluation of Materials
ISSN
1387-974X
eISSN
1572-8188
D.O.I.
10.1007/s11107-015-0594-z
Publisher site
See Article on Publisher Site

Abstract

Stable bias control of lithium niobate Mach-Zehnder modulator (MZM) is crucial for radio-over-fiber (ROF) links, since the bias drift causes deviation from the optimum operating point. In this paper, we propose and experimentally demonstrate a novel dither-free low-bias control technique, especially for deeply modulated, low-biased analog photonic links. In our scheme, a second lightwave passes through the MZM, while the output power is locked. Since the reverse modulation efficiency is very low when the input radio frequency (RF) carrier is as high as GHz, the RF power shows little impact on the optical power even when the bias angle is very low, so that the bias stabilization is achieved. Experiment results show that bias locking at a low-bias position (about $$-81^{\circ }$$ - 81 ∘ ) with phase deviations less than $$\pm 2.6^{\circ }$$ ± 2 . 6 ∘ is achieved even when the input RF voltage is as high as $$1.3 \,V_{\pi }$$ 1.3 V π . Our proposal needs no low-frequency dither, which is promising for ROF links.

Journal

Photonic Network CommunicationsSpringer Journals

Published: Jan 7, 2016

References

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