Danmarks Tekniske Universitet

Michael Galili

Leif Katsuo Oxenløwe

Kresten Yvind

Dagmawi Alemayehu Bekele

Hans Christian Hansen Mulvad

Evarist Palushani

Francesco Da Ros

Jesper Mørk

Zohreh Lali-Dastjerdi

Christophe Peucheret

Hao Hu

Anders Thomas Clausen

Leif Katsuo OXENLØWE

A waveguide-coupled cavity structure configured to exhibit Fano resonance (such as asymmetric Fano resonance or symmetric Fano resonance (inverse Lorentzian resonance), is utilized in an optical receiver or a method for direct detection of coherent optical signals by converting a phase-modulation on a coherent optical signal into an intensity-modulation of the optical signal. The waveguide-coupled cavity structure is designed for a transmission spectrum of the Fano resonance to overlap with a spectrum of the In modulated coherent optical signal to suppress transmission of at least one sideband of the modulated coherent optical signal through the structure, the sideband suppression being asymmetrical with respect to the carrier frequency of the modulated coherent optical signal. The invention may be used for direct detection of more advanced coherent modulation formats such as quadrature phase-shift keying (QPSK) signals and high order quadrature amplitude modulation (n-QAM) signals.

Direct detection of modulated coherent optical signals by means of a structure exhibiting Fano resonance

The invention relates to an all-optical regeneration system for regeneration of optical wavelength division multiplexed WDM data signals in an optical WDM communication system. The system comprises a WDM-to-Optical time domain multiplexing OTDM, WDM-to-OTDM, converter, capable of converting an input WDM data signal comprising multiple wavelength channels into an input OTDM data signal comprising multiple time multiplexed time channels. The system further comprises an all-optical regenerator unit being configured for regenerating the input OTDM data signal into an output OTDM data signal. The system additionally comprises an OTDM-to-WDM converter for converting the output OTDM data signal to an output WDM data signal. An input of the all-optical regenerator unit is in optical communication with an output of the WDM-to-OTDM converter, and an output of the all-optical regenerator unit is in optical communication with an input of the OTDM-to-WDM converter. The invention further relates to a method for all-optical regeneration of WDM data signals.

All-optical regeneration system for optical wavelength division multiplexed communication systems

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Roskilde, Denmark

Michael Galili