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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Wavelength division (de)multiplexing based on dispersive self-imaging.

Y Hu¹, R M Jenkins, F Y Gardes

¹Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, UK. y.hu@surrey.ac.uk

|December 6, 2011

Summary

This summary is machine-generated.

We developed novel wavelength division multiplexers (WDMs) using self-imaging multimode interferometers. These devices offer efficient optical signal separation on a silicon platform, promising scalable solutions for optical communications.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Waveguide Technology

Background:

Wavelength Division Multiplexing (WDM) is crucial for increasing optical communication capacity.
Existing WDM devices face challenges in scalability and fabrication complexity.
Self-imaging multimode interferometers offer unique dispersive properties for optical manipulation.

Purpose of the Study:

To propose and demonstrate a new type of WDM based on self-imaging.
To evaluate the performance of these devices in terms of channel count, crosstalk, and insertion loss.
To assess the design and fabrication ease and platform applicability.

Main Methods:

Theoretical proposal of WDMs utilizing self-imaging multimode interferometers.
Experimental fabrication of proof-of-principle devices on a silicon-on-insulator platform.
Characterization of device performance including channel count, free spectral range, crosstalk, and insertion loss.

Main Results:

Demonstrated 4-channel WDMs with a free spectral range exceeding 90 nm.
Achieved an average crosstalk below -20 dB for a 1 nm bandwidth.
Obtained an insertion loss of less than 2.0 dB.
Predicted potential for higher channel counts and narrower channel spacing.

Conclusions:

Self-imaging multimode interferometers provide an effective platform for WDM devices.
The demonstrated WDMs are easy to design and fabricate.
The underlying concept is versatile and applicable to various planar waveguide platforms, offering a scalable solution for optical networks.