Abstract: Disclosed is a method for optimizing optical fibre based transmission, in particular increasing span length and/or minimizing energy consumption and cost for an optical fibre based transmission link, and the so optimized fibre based transmission link. Further disclosed is a method for minimizing the energy consumption and/or the cost of an optical fibre based transmission link by doubling the number of fibre channels. Also disclosed is a method for minimizing the energy consumption and/or the cost of a repeaterless optical fibre based transmission link.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to an all-optical demultiplexer for an optical orthogonal frequency division multiplexing (OFDM) signal having a centre wavelength. The OFDM signal comprises a plurality of subcarriers, each subcarrier having a symbol rate. The demultiplexer is adapted for spectrally magnifying the OFDM signal and comprises a first time lens, a second time lens, and a dispersive element. The dispersive element is arranged in a signal path between the first time lens and the second time lens to form a time lens telescope. The invention further relates to a method of demultiplexing OFDM signals.

Abstract: The invention relates to an all-optical regeneration system for regeneration of optical wavelength division multi-plexed WDM data signals in an optical WDM communication system. The system comprises a WDM-to-Optical time domain multi-plexing 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.

Abstract: The present invention relates to a system and method that enable transmission of multiple data packet lines as an optical time-division multiplexed signal. The invention provides a method and system that can synchronize data packet signals to a clock and convert them into return-to-zero signals. When multiple data packet lines are converted, they can be multiplexed together and transmitted according to well-known methods.