Abstract: A method for transmitting data in an optical source of an optical distribution network is proposed. The method comprises: obtaining characteristics of a frequency detuning impairment occurring in the transmission of the optical source when switching from a non-transmission to a data transmission; and transmitting data based on the characteristics of the frequency detuning impairment.

Abstract: Method comprises: receiving, at a receiving side of the optical transceiver, a received optical signal, wherein the received optical signal corresponds to a first transmit optical signal carrying the data transmitted by an optical source on a first transmission link that includes an optical fiber, determining an interference component of an interference signal in the received optical signal, wherein the interference component is induced by a transmission by a transmitting side of the optical transceiver of a second transmit optical signal on a second transmission link that includes the optical fiber, and processing the received optical signal, based on the determined interference component, to obtain an estimate of the first transmit optical signal.

Abstract: A process for detecting a detuning which currently exists at a wavelength splitter within an optical fiber transmission network, comprises assessing expected values relating to at least two light sub-carriers, and determining actual values relating to said at least two light sub-carriers. A wavelength shift value which quantifies the existing detuning is obtained from a comparison between the expected and actual values. The process may be completed with updating a tuning of a light source from which the sub-carriers are derived, so as to reduce the wavelength shift.

Abstract: A process for detecting a detuning which currently exists at a wavelength splitter within an optical fibre transmission network, comprises assessing expected values relating to at least two light sub-carriers, and determining actual values relating to said at least two light sub-carriers. A wavelength shift value which quantifies the existing detuning is obtained from a comparison between the expected and actual values. The process may be completed with updating a tuning of a light source from which the sub-carriers are derived, so as to reduce the wavelength shift.

Abstract: The invention relates to a method for controlling access to an out-of-band communication channel in an optical communications network comprising a master device and slave devices connected to the master device via optical fiber, the optical communications network being adapted to enable in-band communications, the out-of-band communication channel being intended to enable transmissions of signalling signals with respect to the in-band communications.

Abstract: The invention relates to a method for managing a passive optical network, said passive optical network comprising at least one few-mode fiber (610) to centralize connections relative to several optical network units to a central office (500), wherein said central office (500) is provided with:—optical line terminations (521-524) to at least emit multiple bandwidths (?1, ?2), and—at least one mode converter (540) acting as a power splitter to multiplex said multiple bandwidths to different power modes, said different power modes being then provided to said at least one few-mode fiber (610).

Abstract: The invention relates to a method for detecting collisions in an out-of-band communication channel, implemented by a master device of an optical communications network enabling in-band communications and further comprising slave devices. The out-of-band communication channel enables transmissions of signalling information with respect to the in-band communications in the form of modulation symbols over successive symbol periods. Collisions occur when plural slave devices access the out-of-band communication channel by using carrier wavelengths matching each other.

Abstract: The invention relates to a method for detecting collisions in an out-of-band communication channel, implemented by a master device of an optical communications network enabling in-band communications and further comprising slave devices. The out-of-band communication channel enables transmissions of signalling information with respect to the in-band communications in the form of modulation symbols over successive symbol periods. Collisions occur when plural slave devices access the out-of-band communication channel by using carrier wavelengths matching each other.

Abstract: The invention comprises a master device and slave, the signalling information containing identifying information aiming at identifying the slave device transmitting said signalling information, an optical communications network being adapted to enable in-band communications, an out-of-band communication channel being intended to enable transmissions of said signalling information with respect to the in-band communications, collisions occurring in the out-of-band communication channel when plural slave devices access the out-of-band communication channel by using respective carrier wavelengths that match each other.

Abstract: The invention relates to a method for controlling access to an out-of-band communication channel in an optical communications network comprising a master device and slave devices connected to the master device via optical fiber, the optical communications network being adapted to enable in-band communications, the out-of-band communication channel being intended to enable transmissions of signalling signals with respect to the in-band communications.

Abstract: For determining equalization parameters for performing equalization for optical signals transmitted by a first device to a second device via an optical band-pass filter, the second device being configured for receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, said carrier wavelength and/or said passband of the optical band-pass filter being a priori unknown, a monitoring device performs: determining information representative of a level of detuning between the carrier wavelength of the optical signals and the nominal wavelength of the optical band-pass filter; and determining said equalization parameters, on the basis of said determined information representative of the level of detuning between the carrier wavelength of the optical signals and the nominal wavelength of the optical band-pass filter.

Abstract: For determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting optical signals to a second device via an optical band-pass filter, the second device having an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, said carrier wavelength and/or said passband of the optical band-pass filter being a priori unknown, a monitoring device performs: monitoring an evolution of a difference level between codewords received by the second device via said optical signals and corresponding codewords transmitted by the first device; and determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of said monitoring.

Abstract: A method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when the carrier wavelength is in the passband of the optical band-pass filter. A monitoring device performs: obtaining an information representative of a time drift between successive symbols of an optical signal received by the second device, from the first device, via the optical band-pass filter; and determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of the information representative of the time drift.

Abstract: For determining equalization parameters for performing equalization for optical signals transmitted by a first device to a second device via an optical band-pass filter, the second device being configured for receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, said carrier wavelength and/or said passband of the optical band-pass filter being a priori unknown, a monitoring device performs: determining information representative of a level of detuning between the carrier wavelength of the optical signals and the nominal wavelength of the optical band-pass filter; and determining said equalization parameters, on the basis of said determined information representative of the level of detuning between the carrier wavelength of the optical signals and the nominal wavelength of the optical band-pass filter.

Abstract: A method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by the optical band-pass filter and transmitted by the first device on a carrier wavelength when the carrier wavelength is included in the passband of the optical band-pass filter. A monitoring device performs: obtaining an information representative of a signal temporal shape corresponding to a symbol of an optical signal received by the second device, from the first device, via the optical band-pass filter; determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of the information representative of the signal temporal shape.

Abstract: For determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting optical signals to a second device via an optical band-pass filter, the second device having an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter, said carrier wavelength and/or said passband of the optical band-pass filter being a priori unknown, a monitoring device performs: monitoring an evolution of a difference level between codewords received by the second device via said optical signals and corresponding codewords transmitted by the first device; and determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of said monitoring.

Abstract: A method for determining a presence of a locking signal in a signal received by an optical receiver device, the optical receiver device configured to be used in an optical communications network, the locking signal being a signal exchanged by optical communication devices of the optical communications network in a phase preceding setting up communications between the optical communication devices. The presence of the locking signal is determined by obtaining a direct current component or a component at twice a frequency at which the locking signal is supposed to be modulated, and by obtaining a contribution of the communication signal, if any, on the component.

Abstract: A device and method to allow to estimate drift induced by temperature variation in a network including a frequency splitter based on a Mach-Zehnder, or alike component, and to track it over time, by adding mirrors to the unused port of the Mach-Zehnder components. Doing so, both OLT and ONU are able to scan a band of frequencies. The frequency corresponding to the nominal wavelength of the component will be reflected on the other port on the same side of the Mach-Zehnder while other frequencies will go through the Mach-Zehnder to be reflected by the mirror and come back to the emitter. By measuring the reflected signal while scanning frequencies, the actual nominal wavelength of the component can be determined.

Abstract: A method configuring an optical transmission interface of at least one first device transmitting optical signals on a path to a second device on a carrier wavelength substantially equal to a nominal wavelength of an optical band-pass filter present on the path, each first device including an optical reception interface to enable receiving optical signals from the second device, the second device including an optical reception interface to enable receiving optical signals output by the first optical band-pass filter and transmitted by any first device on a carrier wavelength substantially equal to the nominal wavelength, the optical transmission interface of each first device being initially configured for transmitting optical signals on a first carrier wavelength.

Abstract: A method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when the carrier wavelength is in the passband of the optical band-pass filter. A monitoring device performs: obtaining an information representative of a time drift between successive symbols of an optical signal received by the second device, from the first device, via the optical band-pass filter; and determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of the information representative of the time drift.