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Multichannel photonic Hilbert transformers based on complex modulated integrated Bragg gratings.

Rui Cheng, Lukas Chrostowski

|March 1, 2018

Summary

Researchers developed multichannel photonic Hilbert transformers using silicon Bragg gratings. These devices enable advanced radio-frequency signal processing, leveraging wavelength for enhanced capacity in multiplexed systems.

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Area of Science:

Photonics
Optical Engineering
Signal Processing

Background:

Multichannel photonic Hilbert transformers (MPHTs) are crucial for advanced signal processing.
Existing designs face limitations in channel count and bandwidth.

Purpose of the Study:

To report novel MPHTs based on integrated silicon Bragg gratings.
To explore the potential of these devices for multichannel single-sideband signal generation.
To introduce wavelength as a design parameter for radio-frequency photonic signal processors.

Main Methods:

Fabrication of MPHTs using single compact spiral integrated Bragg gratings on silicon.
Precise modulation of coupling coefficients via the phase of each grating period.
Characterization of devices with up to nine wavelength channels and ~625 GHz single-channel bandwidth.

Main Results:

Achieved MPHTs with up to nine wavelength channels.
Demonstrated single-channel bandwidths up to ~625 GHz.
Confirmed the feasibility of multichannel single-sideband signal generation.

Conclusions:

The developed MPHTs offer a new approach for radio-frequency photonic signal processing.
Utilizing wavelength as a degree of freedom enhances processor capacity.
These devices hold potential for improving current wavelength division multiplexed systems.