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Microwave photonic filters with negative coefficients based on phase inversion in an electro-optic modulator
José Capmany1, Daniel Pastor, Alfonso Martinez
1Grupo de Comunicaciones Opticas, Departamento de Comunicaciones and IMCO2 Research Institute, Universidad Politécnica de Valencia, Camino de Vera s/n. 46021, Valencia, Spain. jcapmany@dcom.upv.es
Optics Letters
|August 29, 2003
Summary
Researchers developed a new photonic radio frequency (RF) filter using a Mach-Zehnder modulator. This technique enables the creation of filters with negative coefficients, matching theoretical predictions.
Area of Science:
- Photonics
- Radio Frequency (RF) Engineering
- Optical Modulators
Background:
- Photonic RF filters offer advantages in signal processing.
- Implementing filters with specific coefficients, such as negative ones, presents technical challenges.
- Electro-optic Mach-Zehnder modulators are key components in photonic systems.
Purpose of the Study:
- To introduce a novel technical approach for implementing photonic RF filters.
- To leverage the properties of electro-optic Mach-Zehnder modulators for filter coefficient control.
- To experimentally validate the theoretical predictions for filters with negative coefficients.
Main Methods:
- Utilized the pi phase inversion property of radio frequency (RF) signals in an electro-optic Mach-Zehnder modulator.
- Exploited the positive and negative linear slopes of the modulator's transfer function.
- Implemented and tested photonic filters with negative coefficients.
Main Results:
- Successfully demonstrated the implementation of photonic RF filters with negative coefficients.
- Experimental results showed excellent agreement with theoretical predictions.
- The novel approach provides precise control over filter coefficients.
Conclusions:
- The reported technical approach offers a viable method for creating advanced photonic RF filters.
- The use of Mach-Zehnder modulator phase inversion is effective for achieving negative filter coefficients.
- This work validates a new technique for photonic signal processing applications.