Siemens Aktiengesellschaft

Peter Krummrich

Richard Neuhauser

Klaus Kotten

Guido Gentner

Christian Eder

Ulrich Gaubatz

Claus-Jörg Weiske

Claus-J&ouml;rg Weiske

Martin Schreiblehner

Wolgang Mader

The invention relates to a method and device for determining the gain spectrum of a Raman amplifier having an optical amplifier, which is connected in incoming circuit thereto, in a section of a WDM transmission system. A number of spectra are recorded at the output of the Raman amplifier during which the optical amplifier or the Raman amplifier is switched on and off and a high amplified spontaneous emission is generated at the input of the Raman amplifier. Afterwards, the gain spectrum is determined on the basis of the recorded spectra.

Method for determining the gain spectrum of a Raman amplifier in a WDM-transmission system

A method for stabilization of a transparent photonic network having at least one WDM path which has a specific number of channels on which signals can be transmitted, and a method for reconfiguration of a transparent photonic network from a first WDM path to a second WDM path between two points which have a number of channels on which signals can be transmitted.

Method for stabilization and reconfiguration of a transparent photonic network

A Raman amplifier is provided which includes a number of pump lasers whose pump wavelengths and output powers are particularly selected such that the associated optical signal-to-noise ratio curve is optimized.

Raman amplifier

For exact level balancing or signal-to-noise ratio balancing of received signals in a wave-length-division multiplex transmission system, the associated transmitted signal power levels are adjusted. If the maximum permissible dynamic range is exceeded, the individual transmitted signal power levels are compressed, while the total transmitted signal power level is kept at least approximately constant.

Method for channel adjustment of transmission signal power in a wavelength division multiplexing transmission system

A system and method for measuring and compensating for the polarization mode dispersion of first and higher orders for a transmitted optical signal are described wherein the propagation time difference, caused from polarization mode dispersion, between orthogonally polarized signals of the transmitted optical signal can be determined very precisely, and can be compensated for, even above a delay of a bit duration of the data signal.

System and method for measuring and compensating for the polarization mode dispersion of an optical signal

The invention relates to the transmission of optical signals (C-B,L-B) in conventional transmission bands, especially C-bands and L-bands, and of additional optical signals (S-B) in the S-band by means of an optical fiber (OF). At least one optical pump signal (ps, ps) is coupled into the optical fiber (OF) for amplifying the additional optical signals (S-B) by means of the Raman effect, whereby said additional signals are transmitted in the S-band. The wavelength of the at least one optical pump signal (ps, ps) is situated in the wave range of 1,320 nm to 1,370 nm.

Method for transmitting additional optical signals in the s+band

A pumping source is provided for the Raman amplification of an optical wavelength division multiplex signal, wherein the pumping source has a number of pumping lasers with, in each case, different pumping wavelengths. Modules for the angle and/or amplitude modulation of pumping signals of the pumping lasers are connected to the pumping lasers, such that by appropriate adaptation of the modulation of the pumping signals mixing products from four-wave mixing between the pumping signals are suppressed.

Pumping source with a number of pumping lasers for the raman amplification of a WDM signal with minimized four-wave mixing

A method for producing non-equidistant pump waves for Raman amplification of a signal which is passed via an optical waveguide, as well as a pump wave producing apparatus for producing pump waves for Raman amplification of a signal which is passed via an optical waveguide, which apparatus has at least one pump source and is set up such that it can produce pump waves at a first, a second, a third and a fourth mutually equidistant pump wavelength, having a control device which is set up such that it causes, in each case, the production of a pump wave u, v, w at the first, second and fourth pump wavelengths, with the control device being set up such that no pump wave is produced at the third pump wavelength, so that a non-equidistant pump channel pattern is achieved overall.

Multiplexer for providing non-equidistant intervals between pump wavelengths in broadband raman amplifiers

A cascadable optical amplifier arrangement having a modular base amplifier arrangement (BVA) that is constructed in single-mode technology and has at least one amplifier stage (VS to VS ). At least one high-power amplifier stage (HVS ) that has its own active fiber (AF) and at least one pump signal source (PSQ , PSQ ) is connected to the at least one amplifier stage (VS ) of said base amplifier arrangement (BVA). In this way, a stepwise increase of the output power of an already existing base amplifier arrangement (BVA) can be achieved.

Cascadable optical amplifier arrangement

An optical amplifier arrangement having at least one optical amplifier stage (V , V ) and a variably settable attenuator (VDL), whose attenuation spectrum (DV , DV , DV , DV ) assumes an attenuation profile (DV , DV , DV , DV ) that increases or decreases proportionally to wavelength. To reduce tilt of the channel level spectrum of an optical transmission signal, the profile of the attenuation spectrum (DV , DV , DV , DV ) is variably settable. An advantageous structure of the variably settable attenuator according to the invention is furthermore specified.

Optical amplifier arrangement having a variably settable attenuator

A Raman amplifier with a number of pump lasers whose pump signals are regulated. In order to improve the frequency stability, the pump lasers are followed by optical filters. Polarization mixers produce a constant gain for different polarizations of a WDM signal. Matching to different transmission conditions and to a different number of transmission bands can be carried out via a controller.

Raman amplifier with a number of pump sources

A pump source for broadband amplification of a wavelength-division multiplexed signal transmitted via an optical fiber having a number of low-power pump lasers, whose input signal power levels are increased in a conversion fiber. One or more high-power lasers such as Raman cascade lasers on the one hand, and one or more monomode laser diodes with a low output power, on the other hand, are used as the pump lasers. Pump signals from the monomode laser diodes are subjected to Raman amplification in the conversion fiber before providing broadband amplification of the WDM signal in the transmission fiber by stimulated Raman scatter. The powers required for the amplified pump signals at the output of the conversion fiber are achieved by respective pump power increases in the pump signals of the monomode laser diodes, and by using monomode laser diodes with different output powers, as well as via a corresponding arrangement of the input coupling of the output signals of the pump lasers into the conversion fiber.

Pump source with increased pump power for optical broadband Raman amplification

An optical amplifier and optical amplifier arrangement with reduced cross phase modulation wherein in an active fiber of the optical amplifier, the fiber being doped with ions of elements from the group of rare earths, in order to reduce the cross phase modulation of the optical amplifier, at least one active fiber section is allocated a dispersion coefficient having a high magnitude, in which the optical transmission signal to be amplified assumes a high signal level.

Optical amplifier and optical amplifier arrangement with reduced cross phase modulation

An optical transmission system for wavelength-division multiplex signals, having cascaded Raman amplifiers, has a number of pump sources for each Raman amplifier, each having different pump wavelengths sets from one pump source to another pump source. This results in a flat gain spectrum for all the channels in a WDM transmission signal.

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Munich, Germany

Peter Krummrich