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Clock recovery using cascaded LiNbO3 modulator

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Abstract

In this paper, we demonstrate clock recovery from a patterned optical-time-division-multiplexed (OTDM) return-to-zero (RZ) data stream. A cascaded LiNbO3 Mach-Zehnder modulator is employed as an efficient optical-electrical mixer. A phase-locked-loop (PLL) is used to lock the cross-correlation component between the optical signal and a local oscillating signal. As a result, clock signal at 10GHz is extracted from the 160Gb/s optical TDM signal. The measured root-mean-square (RMS) timing jitter of the 10GHz clock signal is ~ 130fs.

©2004 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Schematic diagram of (a) the PLL circuit and (b) cascaded modulator. [Media 2]
Fig. 2.
Fig. 2. RF spectrum at the photodiode produced by a beating of the 160 Gb/s optical data and the 16th harmonic of the electrical input to the modulator. (a) Beat frequency spectrum using cascaded MZ modulator (b) Beat frequency spectrum using a single MZ modulator (c) Spectrum of supermodes in the input optical pulse train. [Media 1]
Fig. 3.
Fig. 3. Waveform of the 160Gb/s patterned input data measured by wide band oscilloscope (Left) triggered by original clock and (Right) triggered by recovered clock
Fig. 4.
Fig. 4. (Left) Waveform of VCO output 10GHz recovered clock triggered by original clock and (Right) its RF spectrum
Fig. 5.
Fig. 5. RF spectrum of the recovered clock for jitter analysis.

Equations (5)

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I input = I 0 [ 1 + k = 0 a k cos ( 2 πk f 1 t ) ]
V mod ( t ) = V o { 1 + k = 0 b k cos [ 2 πk ( f vco + Δ f ) t ] }
T = γ 2 [ 1 + cos ( π ( V B + V mod ( t ) ) V π ) ]
I out = I input · γ 2 [ 1 + cos ( π ( V B + V mod ( t ) ) V π ) ]
σ c = 1 2 πnf p n Δ f p c RB
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