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France Telecom

France Telecom Sa

Nicolas Brochier

Esther Le Rouzic

Sebastien Jobert

Naveena Genay

Benjamin Cuenot

Sébastien Jobert

Jelena Pesic

Bernard Landousies

A system is provided for determining a propagation time of an optical signal between two devices in an optical transmission network. The first device is designed to determine the propagation time following the transmission of an optical measurement signal in a propagation direction towards a second device using an optical link while passing through an intermediate device, which includes at least one amplifier and one chromatic-dispersion compensation module that introduces a delay, and following the reception an optical return signal from the second device using the same optical link in a direction opposite to the propagation direction. The measurement system is configured to extract the return signal output by the intermediate device; regenerate the extracted return signal; feed the regenerated signal into the optical link, at the input of the intermediate device; and obtain a return signal-reception time while taking account the delay introduced by said compensation module.

System for determining a propagation time of an optical signal between two optical devices using an optical link

A method and apparatus for measuring a propagation delay of an optical signal between first and second devices in an optical transmission network, the optical signal being transmitted from the first device to the second device via a first optical fiber and from the second device to the first device via a second optical fiber. The second device includes a loopback having a first mode enabling the optical signal to be routed between the two devices. The method includes: detecting by the second device a triggering by the first device of a propagation delay measurement; receiving a measurement signal transmitted by the first device via the first optical fiber; and configuring the loopback in a second mode in which the loopback injects a return signal into the first fiber in response to the measurement signal. The first device implements a method for determining the propagation delay.

Technique for determining a propagation delay of an optical signal between two optical devices via an optical link

An all-optical converter () for converting an intensity-modulated optical signal into an optical signal modulated to the DPSK format, includes a first input () for a first intensity-modulated optical signal (), a differential encoding module () adapted to perform a differential encoding between the first signal () and a second optical signal synchronous with the first signal (), a device adapted to modulate () the phase of an optical signal () according to the differential encoding performed by the differential encoding module (), and an output () of the device adapted to modulate () delivering an optical signal modulated to the DPSK format ().

All-optical intensity to DPSK converter

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Ploumagoar, France

Nicolas Brochier