Thermal tuning of optical amplifiers in wdm systems

Details Thermal tuning of optical amplifiers in wdm systems Thermal tuning of optical amplifiers in wdm systems

H - Electricity

01

S

H01S 3/16 (2006.01) H01S 3/067 (2006.01) H01S 3/10 (2006.01) H04B 10/12 (2006.01) H04B 10/16 (2006.01) H04B 10/17 (2006.01) H01S 3/102 (2006.01)

Patent

CA 2335249

Techniques for controlling the shape of the gain spectrum of an optical amplifier (13) based on the temperature and level of inversion of the amplifier's amplifying medium (20) are provided. An increase in temperature for an amplifying medium having a high level of inversion results in an increase in gain for longer wavelengths relative to shorter wavelengths, i.e., a counterclockwise tilt of the gain spectrum, while an increase in temperature for an amplifying medium having a lower level of inversion results in the opposite effect, i.e., a clockwise tilt. These effects can be used to compensate for changes in the operating conditions of the amplifier, e.g., to compensate for changes in signal powers. The effects of thermal tuning are especially useful in WDM systems employing multi-stage amplifiers.

L'invention porte sur des techniques de régulation de la forme du spectre de gain d'un amplificateur optique (13) basé sur la température et le niveau d'inversion du milieu (20) amplificateur de l'appareil, un accroissement de la température du milieu amplificateur à niveau élevé d'inversion provoquant un accroissement plus fort de gain pour les grandes longueurs d'ondes que pour les petites, et un basculement dans le sens antihoraire du spectre de gain, tandis qu'un accroissement de la température du milieu amplificateur à faible niveau d'inversion provoque l'effet opposé c.-à-d. un basculement dans le sens horaire. Ces effets peuvent servir à compenser les variations des conditions de fonctionnement de l'amplificateur, par exemple les variations de puissance des signaux. Les effets de la syntonisation thermique s'avèrent particulièrement intéressants dans les systèmes MRL à amplificateurs à plusieurs étages.

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