Dynamic gain equalisation filter based on integrated optical transversal filter with asymmetric combiner

2002 ◽  
Vol 38 (12) ◽  
pp. 560 ◽  
Author(s):  
T. Saida ◽  
K. Okamoto ◽  
K. Takiguchi ◽  
T. Shibata
Keyword(s):  
Transversal Filter ◽  
Integrated Optical ◽  
Dynamic Gain

scholarly journals High performance photonic microwave filters based on a 50GHz FSR optical soliton crystal Kerr micro-comb

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Radio Frequency ◽  
Spectral Range ◽  
High Frequency ◽  
High Performance ◽  
Free Spectral Range ◽  
Microwave Filters ◽  
Rf Filters ◽  
Transversal Filter ◽  
Communications Systems ◽  
Integrated Optical

Abstract We demonstrate a photonic radio frequency (RF) transversal filter based on an integrated optical micro-comb source featuring a record low free spectral range of 49 GHz yielding 80 micro-comb lines across the C-band. This record-high number of taps, or wavelengths for the transversal filter results in significantly increased performance including a QRF factor more than four times higher than previous results. Further, by employing both positive and negative taps, an improved out-of-band rejection of up to 48.9 dB is demonstrated using Gaussian apodization, together with a tunable centre frequency covering the RF spectra range, with a widely tunable 3-dB bandwidth and versatile dynamically adjustable filter shapes. Our experimental results match well with theory, showing that our transversal filter is a competitive solution to implement advanced adaptive RF filters with broad operational bandwidths, high frequency selectivity, high reconfigurability, and potentially reduced cost and footprint. This approach is promising for applications in modern radar and communications systems.

Ion Beam Sputter Deposition Of Ferroelectric Oxide Thin Films

1991 ◽  
Vol 223 ◽  
Author(s):  
Thomas M. Graettinger ◽  
O. Auciello ◽  
M. S. Ameen ◽  
H. N. Al-Shareef ◽  
K. Gifford ◽  
...  
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Growth Parameters ◽  
Ion Beam ◽  
Lead Zirconate ◽  
Electro Optic ◽  
Integrated Optical ◽  
Pzt Films ◽  
Ion Beam Sputter Deposition ◽  
Ferroelectric Oxide

ABSTRACTFerroelectric oxide films have been studied for their potential application as integrated optical materials and nonvolatile memories. Electro-optic properties of potassium niobate (KNbO3) thin films have been measured and the results correlated to the microstructures observed. The growth parameters necessary to obtain single phase perovskite lead zirconate titanate (PZT) thin films are discussed. Hysteresis and fatigue measurements of the PZT films were performed to determine their characteristics for potential memory devices.

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