scholarly journals Plasmonic corrugated waveguide coupled to a rectangular nano-resonator as an optical filter

OSA Continuum ◽  
2020 ◽  
Vol 3 (12) ◽  
pp. 3314
Author(s):  
Mehedi Hasan ◽  
Ferdousi Mayoa ◽  
Md. Sahabul Hossain ◽  
Rajib Ahmed ◽  
Mainul Hossain ◽  
...  
Keyword(s):  
Optical Filter ◽  
Corrugated Waveguide

Performance and Reliability of a MEMS-based tunable optical filter operating in the 1565 nm-1525 nm wavelength range

2002 ◽  
Vol 722 ◽  
Author(s):  
T. S. Sriram ◽  
B. Strauss ◽  
S. Pappas ◽  
A. Baliga ◽  
A. Jean ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Line Width ◽  
Insertion Loss ◽  
Optical Filter ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Reliability Testing ◽  
Silicon Nitride Membrane ◽  
Tunable Optical Filter ◽  
Extensive Performance

AbstractThis paper describes the results of extensive performance and reliability characterization of a silicon-based surface micro-machined tunable optical filter. The device comprises a high-finesse Fabry-Perot etalon with one flat and one curved dielectric mirror. The curved mirror is mounted on an electrostatically actuated silicon nitride membrane tethered to the substrate using silicon nitride posts. A voltage applied to the membrane allows the device to be tuned by adjusting the length of the cavity. The device is coupled optically to an input and an output single mode fiber inside a hermetic package. Extensive performance characterization (over operating temperature range) was performed on the packaged device. Parameters characterized included tuning characteristics, insertion loss, filter line-width and side mode suppression ratio. Reliability testing was performed by subjecting the MEMS structure to a very large number of actuations at an elevated temperature both inside the package and on a test board. The MEMS structure was found to be extremely robust, running trillions of actuations without failures. Package level reliability testing conforming to Telcordia standards indicated that key device parameters including insertion loss, filter line-width and tuning characteristics did not change measurably over the duration of the test.

Asymmetrical clipping optical filter bank multi-carrier modulation scheme

2021 ◽  
Vol 53 (5) ◽  
Author(s):  
Asmaa Ibrahim ◽  
Josep Prat ◽  
Tawfik Ismail
Keyword(s):  
Filter Bank ◽  
Optical Filter ◽  
Modulation Scheme

A Switchable Optical Filter between Band-stop and Band-pass Responses

2020 ◽  
Author(s):  
Weijun Jiang ◽  
Lu Xu ◽  
Xiaolong Liu ◽  
Yu Yu ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Optical Filter ◽  
Band Pass

scholarly journals Analysis of Dielectric Waveguide Grating and Fabry–Perot Modes in Elastic Grating in Optical Detection of Ultrasound

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4081
Author(s):  
Suejit Pechprasarn ◽  
Chayanisa Sukkasem ◽  
Phitsini Suvarnaphaet
Keyword(s):  
Optical Properties ◽  
Dielectric Waveguide ◽  
Figure Of Merit ◽  
Pressure Range ◽  
Optical Filter ◽  
Grating Period ◽  
Wave Mode ◽  
Waveguide Grating ◽  
Fabry Perot ◽  
Optical Grating

In our previous work, we have demonstrated that dielectric elastic grating can support Fabry–Perot modes and provide embedded optical interferometry to measure ultrasonic pressure. The Fabry–Perot modes inside the grating provide an enhancement in sensitivity and figure of merit compared to thin film-based Fabry–Perot structures. Here, in this paper, we propose a theoretical framework to explain that the elastic grating also supports dielectric waveguide grating mode, in which optical grating parameters control the excitation of the two modes. The optical properties of the two modes, including coupling conditions and loss mechanisms, are discussed. The proposed grating has the grating period in micron scale, which is shorter than the wavelength of the incident ultrasound leading to an ultrasonic scattering. The gap regions in the grating allow the elastic grating thickness to be compressed by the incident ultrasound and coupled to a surface acoustic wave mode. The thickness compression can be measured using an embedded interferometer through one of the optical guided modes. The dielectric waveguide grating is a narrow bandpass optical filter enabling an ultrasensitive mode to sense changes in optical displacement. This enhancement in mechanical and optical properties gives rise to a broader detectable pressure range and figure of merit in ultrasonic detection; the detectable pressure range and figure of merit can be enhanced by 2.7 times and 23 times, respectively, compared to conventional Fabry–Perot structures.

scholarly journals Optical Filter Bank Modeling and Design for Multi-Color Visible Light Communications

2021 ◽  
Vol 13 (1) ◽  
pp. 1-19
Author(s):  
Pengfei Ge ◽  
Xintong Ling ◽  
Jiaheng Wang ◽  
Xiao Liang ◽  
Shuo Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Filter Bank ◽  
Optical Filter ◽  
Visible Light Communications

scholarly journals A New 21-cm Line Survey of the LMC

1984 ◽  
Vol 108 ◽  
pp. 395-396
Author(s):  
K. Rohlfs ◽  
J. Kreitschmann ◽  
J. V. Feitzinger
Keyword(s):  
Noise Temperature ◽  
Beam Width ◽  
Main Beam ◽  
Corrugated Waveguide ◽  
Line Survey ◽  
Single Polarization ◽  
Switching Mode ◽  
Half Power ◽  
Channel Separation ◽  
Made In

The measurements were made in Feb. 1982 with the Parkes 64 m telescope using a corrugated waveguide horn with total half-power beam width of 15′, the first sidelobes being 19 dB down, resulting in an aperture efficiency ηA=0.53±0.007, a main beam efficiency of ηmb=0.80±0.005 and a ratio of source flux to antenna temperature of Γ=0.62±0.1 K/Jy (Murray, priv. comm.). A cooled two channel FET frontend used in the frequency switching mode with Δν = 2 MHz resulted in a system noise temperature at zenith of Tsyst = 40 K for one channel and Tsyst = 50 K for the other. Each frontend channel received a single polarization mode, and this radiation was then further analysed in a 2 × 512 channel autocorrelation spectrometer set at a channel separation of 3.906 KHz corresponding to a velocity resolution of V = 0.824 km s−1. Hanning smoothed this resulted in a σT = 0.05 K for the average of both polarization.

Optical filter design for multiwavelength erbium-doped fiber ring lasers

2002 ◽  
Vol 208 (1-3) ◽  
pp. 167-172 ◽  
Author(s):  
Silvia Abad ◽  
Manuel López-Amo ◽  
Sebastián Jarabo
Keyword(s):  
Filter Design ◽  
Optical Filter ◽  
Fiber Ring ◽  
Fiber Ring Lasers ◽  
Ring Lasers ◽  
Erbium Doped

scholarly journals 100 MHz high-speed strain monitor using fiber Bragg grating and optical filter applied for magnetostriction measurements of cobaltite at magnetic fields beyond 100 T

2018 ◽  
Vol 536 ◽  
pp. 847-849 ◽  
Author(s):  
Akihiko Ikeda ◽  
Toshihiro Nomura ◽  
Yasuhiro H. Matsuda ◽  
Shuntaro Tani ◽  
Yohei Kobayashi ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Fiber Bragg Grating ◽  
High Speed ◽  
Optical Filter ◽  
Bragg Grating
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