Conference Paper

Photonic microwave filter with single bandpass response based on Brillouin processing and SSB-SC

Nanophotonics Technol. Center, Univ. Politec. de Valencia, Valencia, Spain
Conference: Microwave Photonics, 2009. MWP '09. International Topical Meeting on
Source: IEEE Xplore


A photonic structure for microwave filtering with single passband and the capability of continuously tuning the filter response over a broad microwave range is proposed and experimentally demonstrated. The scheme is based on using stimulated Brillouin scattering and single sideband modulation with suppressed carrier (SSB-SC).

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    • "The gain (absorption) response of the SBS process can be used as a band-pass (band-reject) filter where the filter extinction depends on the G parameter. Microwave photonic filters with shape reconfiguration and widely tunable pass-band and notch have recently been demonstrated exploiting SBS in several km long optical fibers [30] [43] [61]. While high-Q MWP filters (∼1000) with wide tunability (1–20 GHz) and large extinction ∼40 dB were reported, use of long lengths in these demonstrations prohibit photonic integration. "
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    ABSTRACT: Demonstration of continuously tunable delay, low-noise lasers, dynamically controlled gratings, and optical phase shifting using the stimulated Brillouin scattering (SBS) process has lead to the emergence of SBS as a promising technology for microwave photonics. On-chip realization of SBS enables photonic integration of microwave photonic signal processing and offers significantly enhanced performance and improved efficiency. On-chip stimulated Brillouin scattering is reviewed in the context of slow-light based tunable delay, low-noise narrow linewidth lasers and filtering for integrated microwave photonics. A discussion on key material and device properties, necessary to enable on-chip Brillouin scattering using both the single-pass and resonator geometry, is presented along with an outlook for photonic integration of microwave signal processing and generation in other platforms.
    Full-text · Article · Sep 2014 · Laser & Photonics Review
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    • "It is noted that the undesirable RF signals out of the passband cannot be recovered in the PD and fall into the noise of the system. This is different from that reported in [13] and [14] where the undesirable RF signals can also be recovered in the PD due to the intensity modulation. Fig. 6. "
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    ABSTRACT: We present a novel microwave photonic single-passband filter based on polarization control through simulated Brillouin scattering (SBS). The principle of the filter is based on a vector SBS process, which is different from the previously reported scalar SBS technique. For a radio-frequency (RF) modulated signal launched to the proposed processor, the state of polarization (SOP) of the optical carrier is rotated by 90° through a two-step SBS process. As a result, the RF signals cannot be recovered in the photodetector (PD). To recover the desirable RF signal, the SOP of the RF modulated sideband is rotated by another pump wave. Since the orthogonal polarization condition between the optical carrier and the sideband is destroyed, the desirable RF signal can be recovered. By adjusting the wavelength of the pump wave, the frequency response of the filter is tunable in a frequency range from ~2 to 20 GHz with out-of-band rejection of ~30 dB and -3 dB bandwidth of ~20 MHz. In addition, for any modulation format, it is converted to the single-sideband (SSB) modulation by the proposed filter. Therefore, the system is expected to be immune to the fiber dispersion-induced power fading. Moreover, it is independent of the modulation formats of the incoming signal wave. The filter structure can be inserted anywhere in conventional fiber-optic links without the need for modifying the link configuration and the transmitter.
    Preview · Article · Aug 2013 · IEEE Photonics Journal
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    • "rejection ratio performance is improved compared with that realized by previous single-sideband modulator approaches [10], [12], which correspond to ¼ =2, as is shown in Fig. 4, especially when the pump power is low. Fig. 4 also shows that the tolerance of around its optimum value of 0 is good, for obtaining a high out-of-band rejection ratio of 9 40 dB, and that the tolerance improves as the SBS gain increases. "
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    ABSTRACT: A new structure that realizes a switchable microwave photonic filter, which can be readily switched between a bandpass filter and a notch filter, is presented. It is based on optical processing the sidebands of the RF-modulated signal that is obtained after a dual-drive Mach–Zehnder modulator (DDMZM), using stimulated Brillouin scattering (SBS) effects. Switching of the filter function is simply and conveniently obtained by changing the dc bias to the DDMZM. In addition, the center frequency of the switchable filter can be tuned over a wide frequency range. A detailed analysis and simulation of the DDMZM operation in conjunction with the SBS technique is presented in order to obtain the required optimum bias conditions for the DDMZM for realizing the switching action between the single-bandpass filter and the notch filter and also to select the optimum pump power for the SBS operation. Experimental results demonstrate the ability of this structure to switch between a high-resolution bandpass filter and a high-resolution notch filter, with Q values around 400–500, and the ability to operate over a frequency range of 2–20 GHz.
    Preview · Article · Oct 2012 · IEEE Photonics Journal
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