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All-optical bandpass microwave filter based on an electro-optic phase modulator

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Abstract

A novel all-optical microwave filter with a frequency response equivalent to a bandpass filter is presented. An electro-optic phase modulator combined with a dispersive device is employed to eliminate the baseband resonance of a typical lowpass filter. A two-tap bandpass transversal microwave filter with a null-to-null bandwidth of 8.8 GHz and a 35-dB notch rejection level is demonstrated.

©2004 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Block diagram of the proposed bandpass filter. LD: laser diode, PC: polarization controller, PD: photodiode.
Fig. 2.
Fig. 2. (a) Optical phase modulation. (b) Recovered RF power vs. RF frequency.
Fig. 3.
Fig. 3. Frequency response H 1 (ω). Solid line: 1550 nm; dashed line: 1590 nm; dotted line: 1525 nm.
Fig. 4.
Fig. 4. Frequency response of the proposed bandpass filter.

Equations (3)

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E RF ( t ) cos ( π χ λ 0 2 f m 2 c + π 2 ) · cos ( 2 π f m t + φ ) ,
H 2 ( ω ) n = 1 N exp ( j φ n ) = n = 1 N exp [ j ω m · ( n 1 ) · T ] ,
H ( ω ) = H 1 ( ω ) · H 2 ( ω ) .
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