Method for determining the gain spectrum of a Raman amplifier in a WDM-transmission system
AssigneeSiemens Aktiengesellschaft
InventorPeter Krummrich
Life of this patent
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Abstract
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.
Claims9
A method for determining a gain spectrum for a Raman amplifier located downstream from an optical fiber amplifier in a WDM transmission system, comprising:
- switching the Raman amplifier into one respective amplifier state selected from an on state and an off state;
- measuring an optical spectra at an output of the Raman amplifier with a pumping source when the optical fiber amplifier is switched into an active state to cause amplified spontaneous emission;
- and
- determining the gain spectrum from these spectra, wherein a first spectrum is measured with the pumping source for the Raman amplifier switched off and the pumping source for the optical fiber amplifier switched on, a third spectrum is measured with the pumping source for the Raman amplifier switched on and the pumping source for the optical fiber amplifier switched on, and the gain spectrum for the Raman amplifier is calculated according to the following rule:
- Gain Spectrum=(Third Spectrum)/(First Spectrum).
A method for determining a gain spectrum for a Raman amplifier located downstream from an optical fiber amplifier in a WDM transmission system, comprising:
- switching the Raman amplifier into one respective amplifier state selected from an on state and an off state;
- measuring an optical spectra at an output of the Raman amplifier with a pumping source when the optical fiber amplifier is switched into an active state to cause amplified spontaneous emission;
- and
- determining the gain spectrum from these spectra, wherein a first spectrum is measured with the pumping source for the Raman amplifier switched off and the pumping source for the optical fiber amplifier switched on, a second spectrum is measured with the pumping source for the Raman amplifier switched on and the pumping source for the optical fiber amplifier switched off, a third spectrum is measured with the pumping source for the Raman amplifier switched on and the pumping source for the optical fiber amplifier switched on, and the gain spectrum for the Raman amplifier is calculated according to the following rule:
- Gain Spectrum=(Third Spectrum−Second Spectrum)/(First Spectrum).
An arrangement for determining the gain spectrum of a Raman amplifier located downstream from an optical fiber amplifier in a WDM transmission system, comprising:
- a control device to selectively switch to one respective state selected from an on state and off state the pumping sources for the Raman amplifier and to activate the optical fiber amplifier when the optical fiber amplifier is in the active state causing amplified spontaneous emission;
- spectra generated with the pumping sources for the Raman amplifier switched in one of the respective on and off states are measured at an optical spectrum analyzer downstream from the Raman amplifier;
- and
- a gain spectrum determined from these spectra.
Dependencies are inferred from the claim text.