Alcatel

Alcatel Alsthom Compagnie Generale D'electricite

Alcatel Submarine Networks

Hans Bissessur

Catherine Graver

Leon Goldstein

Fabrice Devaux

Christopher Janz

Roland Mestric

Christian Duchet

Omar Ait Sab

Francedillaois Brillouet

Alain Bodere

Domonique Chiaroni

Jean Louis Gentner

Various example embodiments for supporting supervision in optical communication systems are presented. Various example embodiments for supporting supervision in optical communication systems may be configured to support supervision of an optical path including a remote optically pumped amplifier (ROPA) and, thus, supervision of the ROPA. Various example embodiments for supporting supervision of an optical path including a ROPA may be configured to support supervision of the optical path including the ROPA based on a pair of optical supervisory paths configured to extract a pair of optical supervisory signals from an optical path in a first direction and to insert the pair of optical supervisory signals into an optical path in a second direction. Various example embodiments for supporting supervision of an optical path including a ROPA may be configured to support supervision of the optical path including the ROPA based on a pair of optical time-domain reflectometer (OTDR) paths.

Supervision of an optical path including an amplifier

The transmission system is suitable for amplitude modulated controlled phase optical signals (S) having an optical phase in each low level pulse that precedes or follows a high level pulse. The system includes an optical link (L) and, to allow a high transmitting power, optical corrector means (FG) are provided for applying optical filtering to the signal R at the exit (B) of the link and/or at one point or a plurality of points of the link (L), to compensate widening of its spectrum that the controlled phase signal (S) may suffer because of phase self-modulation during its transmission. Application to long-haul optical transmission.

Optical transmission system

An optical modulation scheme for transmitting data over a fiber optic transmission line is proposed where the following steps are realized: creating a NRZ signal by amplitude modulation, modulating two branches of a interferometer structure by complementary electrical signals, and shifting one of the electrical signals against the other electrical signal in time. Further, an optical transmitter is proposed which can modulate the light in the new proposed modulation scheme.

Modulation scheme for NRZ signals and transmitter

An optical signal regenerator includes a mechanism for reconstituting an optical signal carrier wave. The optical signal is thus regenerated on the same wavelength as the incoming carrier wave.

Regenerator with reconstitution of an optical signal carrier wave

The invention relates to a semiconductor optical reflector serving in particular for being disposed facing an integrated laser cavity so as to feed light back into said cavity, and enable it to oscillate continuously. The reflector is made up of a plurality of cascaded Bragg reflector sections. More particularly, said sections are of the same length L and have the same coupling coefficient, and the length L of each pair of sections is given by the following relationship:

Semiconductor optical reflector and a method of manufacturing the same

A semiconductor Bragg reflector and to a method of fabricating it. The reflector comprises a plurality of stacked layers on a substrate of a III-V type material, one of the stacked layers forming a holographic grating. The layer forming the grating comprises an alternating succession of air pockets and of III-V type material. Such a reflector is particularly suitable for use in laser devices.

Semiconductor Bragg reflector and a method of fabricating said reflector

The demultiplexer comprises a diffraction space defined by a reception surface coupled to a grating. In order to obtain output waves of flattened spectral response, the input waveguide and the reception surface are dimensioned so that the input wave diffracts over said surface and presents a plurality of secondary lobes. The demultiplexer is particularly applicable to optical communications systems with wavelength multiplexing.

Growing community of inventors

Paris, France

Hans Bissessur