Si_3N_4 ring resonator-based microwave photonic notch filter with an ultrahigh peak rejection (original) (raw)
Related papers
Demonstration of a Tunable Microwave-Photonic Notch Filter Using Low-Loss Silicon Ring Resonators
Journal of Lightwave Technology, 2000
We present a fully tunable multistage narrowband optical pole-zero notch filter that is fabricated in a silicon complementary metal oxide semiconductor (CMOS) foundry. The filter allows for the reconfigurable and independent tuning of the center frequency, null depth, and bandwidth for one or more notches simultaneously. It is constructed using a Mach-Zehnder interferometer (MZI) with cascaded tunable all-pass filter (APF) ring resonators in its arms. Measured filter nulling response exhibits ultranarrow notch 3 dB BW of 0.6350 GHz, and nulling depth of 33 dB. This filter is compact and integrated in an area of 1.75 mm 2 . Using this device, a novel method to cancel undesired bands of 3 dB bandwidth of 910 MHz in microwave-photonic systems is demonstrated. The ultranarrow filter response properties have been realized based on our developed low-propagation loss silicon channel waveguide and tunable ring-resonator designs. Experimentally, they yielded a loss of 0.25 dB/cm and 0.18 dB/round trip, respectively.
Compact Notch Microwave Photonic Filters Using On-Chip Integrated Microring Resonators
IEEE Photonics Journal, 2013
We propose and experimentally demonstrate a compact notch microwave photonic filter (MPF) using two integrated microring resonators (MRRs) on a single siliconon-insulator (SOI) chip. The free spectral ranges (FSRs) of two cascaded MRRs are 160 GHz and 165 GHz, respectively. Due to the vernier effect, the transmission spectrum of cascaded MRRs is a series of bimodal distribution whose interval is an arithmetic sequence. By locating the laser wavelength at the middle of different bimodal intervals and fine tuning it properly, both central frequency and bandwidth of the notch MPF can be tunable. In the experiment, the tunability of central frequency and 3-dB bandwidth are demonstrated from 2.5 GHz to 17.5 GHz and from 6 GHz to 9.5 GHz, respectively. The best rejection ratio of the notch filter is larger than 40 dB. This approach will allow the implementation of low-cost, very compact, and integrated notch MPFs in a silicon chip.
Single Bandpass Photonic Microwave Filter Based on a Notch Ring Resonator
IEEE Photonics Technology Letters, 2010
A novel tunable single bandpass photonic microwave filter is proposed. It is based on optically filtering one of the sidebands of a phase-modulated optical carrier by means of the notch response of a silicon-on-insulator ring resonator. The filter response can be tuned by changing the laser wavelength. Experimental results to prove the concept are provided.
A tunable photonic microwave notch filter using a multiple wavelength optical source
Microwave and Optical Technology Letters, 2010
at 3.8 GHz is clearly observed, which gives about À33 dB rejection. At the rejection band of 2.3-12 GHz, the rejection of the transmission is less than about À20 dB. In Figure 5, the simulated result is in well agreement with the measured result. In Figure 6, the measured result of the proposed LPF provides better rejection characteristics than that of the conventional one whose size is 38.3 Â 25 mm 2. 4. CONCLUSIONS A compact LPF for wideband rejection is discussed and its brief design procedure is also described. DSISS and BDGS may yield slow wave effect, which can be resulted in small circuit size, sharp cutoff, and wide band rejection characteristics compared with the conventional LPF using SISS and CDGS. The size reduction of the proposed LPFs is about 23% compared with the conventional LPF. The proposed LPF is obtained in wideband rejection that is below À20 dB from 2.3 to 12 GHz.
Tunable microwave photonic notch filter using on-chip stimulated Brillouin scattering
Optics Communications, 2014
A novel tunable microwave photonic notch filter using a phase-modulated dual-wavelength fiber laser is presented. A stable dual-wavelength erbium-doped fiber laser with a linear cavity is formed by a polarization-maintaining uniform fiber Bragg grating (PM-FBG) and a polarization maintaining linearly chirped fiber Bragg grating (PM-LCFBG), both of which were fabricated on a high-birefringence (Hi-Bi) fiber. It is found that a stable room-temperature dual-wavelength operation can be achieved due to the presence of two reflection peaks arising from the orthogonal states of polarization (SOP) of the PM-FBG. Experimental results show stable dual-wavelength lasing operation with a wavelength separation of $0.36 nm and a large optical signal-to-noise ratio (OSNR) of over 40 dB under room temperature. The dual-wavelength fiber laser is combined with a phase modulator and a segment of single-mode fiber (SMF) as a dispersive device to form a tunable microwave photonic notch filter. By stretching the PM-FBG to tune the wavelength separation of the dual-wavelength fiber laser, a tunable microwave photonic notch filter with various free spectral ranges (FSRs) and a rejection ratio greater than 35 dB was developed.
Continuously tunable photonic radio-frequency notch filter
IEEE Photonics Technology Letters, 1997
We present a continuously tunable nonrecursive radio-frequency (RF) photonic filter. The filter provides fine tuning through the use of a novel RF phase shifter and coarse tuning using an all optical variable time delay. This architecture permits wide-band continuous tuning of the filter null frequency and is useful in applications such as moving target indication (MTI) in an airborne radar.
Tunable Photonic Microwave Notch Filter With Negative Coefficient Based on Polarization Modulation
IEEE Photonics Technology Letters, 2007
A novel tunable photonic microwave notch filter with negative and positive coefficients is proposed and experimentally demonstrated. The coefficients can be achieved by polarization modulation along with an electrical signal. The two polarization-modulated signals, which have a relative time delay, are combined, and detected by a photodetector. The transfer response of the filter shows a very stable operation irrespective of the coherence length of the source used. Moreover, the free spectral range of the filter, which shows a sharp notch, can be changed by using a tunable differential group delay generator over the range of 3.16-4.31 GHz.
Journal of Optics, 2012
A reconfigurable microwave photonic filter based on parallel-cascaded silicon microrings is proposed and demonstrated with numerical simulation. A Mach-Zehnder interferometer (MZI) is introduced between two adjacent microrings. Through tuning the MZI, the feedback ratios of adjacent rings can be tuned so that both the bandwidth and shape of filter response can be adjusted while the central wavelength remains constant and the sidelobes can also be remarkably suppressed.