| 1. |
- Fu, Hongyan, et al.
(författare)
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Tunable all-optical microwave notch filter with a negative tap based on a semiconductor optical amplifier and a dispersive medium
- 2009
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Ingår i: Optics and Laser Technology. - : Elsevier BV. - 0030-3992 .- 1879-2545. ; 41:3, s. 213-216
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Tidskriftsartikel (refereegranskat)abstract
- A tunable all-optical microwave notch filter with a negative tap based on a semiconductor optical amplifier and a dispersive medium is demonstrated. A negative tap is realized through the cross gain modulation in the semiconductor optical amplifier. The free spectrum range of the notch filter can be tuned by tuning the wavelength of one of the two laser sources. The influence of the amplitude mismatch of the two lasers on the performance of the filter is analyzed. The present notch filter is easy to implement and cost-effective.
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| 2. |
- Zhu, Kun, et al.
(författare)
-
A Simple and Tunable Single-Bandpass Microwave Photonic Filter of Adjustable Shape
- 2008
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 20:21-24, s. 1917-1919
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Tidskriftsartikel (refereegranskat)abstract
- A simple and tunable single-hand pass microwave photonic filter of adjustable shape is proposed and experimentally demonstrated. The filter is based on multiple sources (spectrum-sliced by a Mach-Zehnder interferometer) and two cascaded incoherent optical structures, namely, a dispersion medium of 50-km single-mode fiber and a fiber ring delay line. In the experimental range from 1.0 to 3.8 GHz, a discretely tunable single-hand pass filter with a high Q-factor or a flat-top response is achieved by carefully matching the transfer functions of the two individual optical structures.
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| 3. |
- Zhu, Kun, et al.
(författare)
-
All-optical coherence-free microwave filter with switchable passbands based on phase and intensity hybrid modulation
- 2011
-
Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018 .- 1873-0310. ; 284:1, s. 140-143
-
Tidskriftsartikel (refereegranskat)abstract
- A simple all-optical coherence-free microwave notch filter is proposed and experimentally demonstrated. The filter with switchable passbands is based on a single-wavelength optical source and phase-intensity hybrid modulation scheme. The DC bias voltage applied to the Mach-Zehnder intensity modulator can be adjusted to switch signs of the tap coefficients, which affect the baseband response. Both lowpass and bandpass filtering responses are observed in the experiment and agree well with the simulated results.
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