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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
Passive Filters01:27

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
Filtration00:53

Filtration

Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
High-Performance Liquid Chromatography: Instrumentation00:57

High-Performance Liquid Chromatography: Instrumentation

High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.

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Related Experiment Video

Updated: Jun 7, 2026

Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
20:00

Single Molecule Fluorescence Microscopy on Planar Supported Bilayers

Published on: October 31, 2015

High-performance lensless in-line filters.

Y Wang, T Sato, J Minowa

    Applied Optics
    |October 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Expanded-core fibers enable lensless in-line bandpass filters with low insertion and high backreflection losses. Optimized heating conditions suppressed diameter reduction, overcoming a key trade-off in fiber optics.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics Technology

    Background:

    • Lensless in-line bandpass filters are crucial optical components.
    • Achieving low insertion loss and high backreflection loss simultaneously presents a significant challenge.

    Purpose of the Study:

    • To demonstrate lensless in-line bandpass filters using expanded-core fibers.
    • To resolve the trade-off between insertion loss and backreflection loss.

    Main Methods:

    • Utilizing expanded-core fibers with a large modal-field diameter.
    • Experimentally optimizing heating conditions during fiber processing.

    Main Results:

    • Achieved lensless in-line bandpass filters with low insertion losses.
    • Demonstrated high backreflection losses.
    • Suppressed outer diameter reduction in expanded-core fibers under optimized heating.

    Conclusions:

    • Expanded-core fibers are effective for creating high-performance lensless in-line bandpass filters.
    • Optimized fabrication processes can mitigate challenges associated with large modal-field diameters.