Acta Optica Sinica, Volume. 29, Issue 9, 2534(2009)
All-Optical SOA-Based Microwave Filter with Passband and Stopband Interchanged
In order to satisfy the applications requirement in fiber-radio links and phased array antennas,a novel microwave photonic filter with passband and stopband interchanged is proposed and demonstrated. The filter is based on a recirculating delay line loop with a semiconductor optical amplifier (SOA) followed by a tunable narrowband optical filter. The negative tap is generated by using the wavelength conversion employing the cross-gain modulation of the amplified spontaneous emission spectrum of the SOA. When the central wavelength of the optical filter is aligned with the laser wavelength, a microwave bandpass filter is obtained. On the other hand, when the optical filter detunes from the laser wavelength a little, a narrow notch filter with flat passband is realized. The structure can be operated as a high Q or notch filter with flat passband by tuning the central wavelength of the optical filter.
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Xu Enming, Zhang Xinliang, Zhou Lina, Zhang Yu, Huang Dexiu. All-Optical SOA-Based Microwave Filter with Passband and Stopband Interchanged[J]. Acta Optica Sinica, 2009, 29(9): 2534
Category: Optical Devices
Received: Nov. 28, 2008
Accepted: --
Published Online: Oct. 9, 2009
The Author Email: Enming Xu (enmingxu@gmail.com)