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Cascaded Op Amps

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...

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Writing Bragg Gratings in Multicore Fibers

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Published on: April 20, 2016

Compact ultrabroad-bandwidth cascaded arrayed waveguide gratings.

Arthur van Wijk, Christopher R Doerr, Zain Ali

|May 15, 2020

Summary

This summary is machine-generated.

We developed a compact, high-resolution, ultrabroad-bandwidth arrayed waveguide grating (AWG) on silicon nitride. This innovative device offers 210 channels over a 190 nm bandwidth, significantly reducing optical loss for broader applications.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Nanophotonics

Background:

Arrayed waveguide gratings (AWGs) are crucial for wavelength-selective optical signal processing.
Achieving ultrabroad bandwidths and high resolution in compact AWG devices remains a challenge.
Silicon nitride (Si3N4) platforms offer advantages for integrated photonic devices due to their low loss and high refractive index.

Purpose of the Study:

To present a novel compact, high-resolution, and ultrabroad-bandwidth cascaded AWG.
To demonstrate an innovative design for achieving a 190 nm optical bandwidth with 1 nm spectral resolution.
To reduce optical loss compared to conventional AWG designs.

Main Methods:

Realization of a cascaded AWG using a silicon nitride platform.
Implementation of a 1x3 flat-passband AWG as a primary filter and three 1x70 AWGs as secondary filters.
Utilizing a multiple-input multi-mode interference (MMI) coupler in the primary AWG for ultrabroad bandwidth.

Main Results:

Achieved a 190 nm optical bandwidth with 1 nm spectral resolution in a compact 1.1 × 1.0 cm^2 device.
Demonstrated a cascaded AWG with 210 output channels.
Reduced optical loss to 4 dB at the central channel, 3 dB lower than conventional designs.
Proposed a novel low-loss design (∼0.8 dB) for weak light intensity applications.

Conclusions:

This work presents the first demonstration of an ultrabroad-bandwidth cascaded AWG on a small footprint.
The innovative MMI-based design significantly enhances bandwidth and reduces loss.
The proposed low-loss design opens possibilities for sensitive applications like Raman spectroscopy.