A computation unit uses an assumed chromatic dispersion amount to compensate for dispersion of a coherently received optical signal and performs arithmetic of a signal power of the optical signal that is dispersion compensated. The computation unit performs computation of an evaluation function when a signal power and a delayed signal power obtained by applying a predetermined delay to the signal power satisfy a threshold condition. The evaluation function is a function for evaluating whether the assumed chromatic dispersion amount is a chromatic dispersion amount of the optical signal using the difference between the signal power and the delayed signal power. The chromatic dispersion amount calculation unit calculates a chromatic dispersion amount of the optical signal based on the computation result of the evaluation function by the computation unit when each of a plurality of different assumed chromatic dispersion amounts is used.

An optical transmission system includes: a transmission unit configured to co-propagate a signal light in which data is modulated and an idler light having complex amplitude that is phase conjugate with the signal light via an optical transmission medium; at least one optical amplifier configured to perform a phase sensitive amplification operation through an action among the signal light, the idler light, and an excitation light in a nonlinear medium; and a reception unit configured to receive the signal light that has been amplified by the optical amplifier, coherently detect the signal light and the idler light individually, and conduct a diversity synthesis to demodulate the data.

An optical transmission system includes: a transmission unit configured to co-propagate a signal light in which data is modulated and an idler light having complex amplitude that is phase conjugate with the signal light via an optical transmission medium; at least one optical amplifier configured to perform a phase sensitive amplification operation through an action among the signal light, the idler light, and an excitation light in a nonlinear medium; and a reception unit configured to receive the signal light that has been amplified by the optical amplifier, coherently detect the signal light and the idler light individually, and conduct a diversity synthesis to demodulate the data.

Disclosed is a high-frequency assembly (1), including a cable, the cable including at least one dielectric waveguide fiber (11) with a first end (111) and an opposed second end (112). The high-frequency assembly includes a high-frequency circuit (14) and an interface unit (12, 13, 15, 16). The at least one dielectric waveguide fiber (11) is at the first end (111) operatively coupled with the high-frequency circuit via the interface unit (12, 13, 15, 16). The interface unit (12, 13, 15, 16) is designed to inject a high-frequency signal into the dielectric waveguide fiber and/or to receive a high-frequency signal from the at least one dielectric waveguide fiber (11) at the first end (111). The high-frequency signal has a first signal component of a first polarization direction and a second signal component of a second polarization direction, wherein the high-frequency assembly (1) is designed to inject the first signal component and the second signal component in a defined manner and/or to split a received high-frequency signal into the first signal component and the second signal component. Disclosed is further a method for transmitting a high-frequency signal using a high-frequency assembly.

Disclosed is a high-frequency assembly (1), including a cable, the cable including at least one dielectric waveguide fiber (11) with a first end (111) and an opposed second end (112). The high-frequency assembly includes a high-frequency circuit (14) and an interface unit (12, 13, 15, 16). The at least one dielectric waveguide fiber (11) is at the first end (111) operatively coupled with the high-frequency circuit via the interface unit (12, 13, 15, 16). The interface unit (12, 13, 15, 16) is designed to inject a high-frequency signal into the dielectric waveguide fiber and/or to receive a high-frequency signal from the at least one dielectric waveguide fiber (11) at the first end (111). The high-frequency signal has a first signal component of a first polarization direction and a second signal component of a second polarization direction, wherein the high-frequency assembly (1) is designed to inject the first signal component and the second signal component in a defined manner and/or to split a received high-frequency signal into the first signal component and the second signal component. Disclosed is further a method for transmitting a high-frequency signal using a high-frequency assembly.

An optical system (100) is described including: a reconfigurable optical device (103) with multiplexing wavelength division, comprising a plurality of actuators (A1-AN) and having associated a number of optical channels (M) and a number of degrees of freedom (N) lower than the number of optical channels; an optical stimulus source (106) connected to said reconfigurable optical device (103) to provide an optical stimulation signal (S.sub.in) having a wavelength band including a plurality of wavelengths associated with the optical channels; an optical-electric conversion device (200) configured to receive from said reconfigurable optical device (103) an optical monitoring signal (S.sub.out) corresponding to the optical stimulation signal (S.sub.in) and to provide a group of electrical signals of intensity (S.sub.EL1-S.sub.ELK) each representative of an intensity of the optical monitoring signal (S.sub.out) evaluated at a relative wavelength included in said band. The system also includes a control device (110) configured to control the plurality of actuators (A1-AN) according to said group of electrical signals (S.sub.EL1-S.sub.ELK) and according to a control law.

A wavelength converter includes an optical waveguide substrate configured to include a plurality of optical waveguides formed with different design values, an incidence-side optical fiber from which signal light and excitation light are incident to the optical waveguide substrate, and an emission-side optical fiber to which light including converted light having a wavelength different from a wavelength of the signal light is extracted from the optical waveguide substrate, wherein the incidence-side optical fiber and the emission-side optical fiber are optically coupled to one optical waveguide among the plurality of optical waveguides.

A wavelength converter includes an optical waveguide substrate configured to include a plurality of optical waveguides formed with different design values, an incidence-side optical fiber from which signal light and excitation light are incident to the optical waveguide substrate, and an emission-side optical fiber to which light including converted light having a wavelength different from a wavelength of the signal light is extracted from the optical waveguide substrate, wherein the incidence-side optical fiber and the emission-side optical fiber are optically coupled to one optical waveguide among the plurality of optical waveguides.

In order to make a communicable distance in an optical cable of an optical signal which is subjected to amplitude modulation longer, a re-modulation device is provided with: an acquisition unit that acquires, from a first modulation optical signal obtained by performing first amplitude modulation on an optical signal with second data sent from a modulation transmission device to a demodulation reception device, the second data; and a re-modulation unit that, when determining passing of the first modulation optical signal, sends, to the demodulation reception device, a second modulation optical signal obtained by performing second amplitude modulation on the inputted optical signal with the second data.

In order to make a communicable distance in an optical cable of an optical signal which is subjected to amplitude modulation longer, a re-modulation device is provided with: an acquisition unit that acquires, from a first modulation optical signal obtained by performing first amplitude modulation on an optical signal with second data sent from a modulation transmission device to a demodulation reception device, the second data; and a re-modulation unit that, when determining passing of the first modulation optical signal, sends, to the demodulation reception device, a second modulation optical signal obtained by performing second amplitude modulation on the inputted optical signal with the second data.