Redc Optical Networks Inc.

Finisar Israel Ltd.

Finisar Corporation

Tomer Eliyahu

Uri Ghera

David Menashe

Alex Shlifer

Eyal Sarid

Methods for optimizing a noise figure of a variable gain hybrid amplifier (HA) which includes a variable gain Raman amplifier with adjustable average gain Gand gain tilt Tand a variable gain lumped amplifier with adjustable average gain Gand gain tilt T. In various embodiments, the methods include receiving as input a required hybrid amplifier average gain Gvalue and a required gain tilt Tvalue and deriving a set of G, T, Gand Tvalues which yield an optimal optimized hybrid amplifier NF and satisfy the conditions G+G=Gand that T+Tis within a specified hybrid amplifier operating tilt range. In some embodiments, the derived Tand Tvalues satisfy the condition T+T=T.

Hybrid optical amplifier with optimized noise figure

Efficient wavelength calibration in a WDM optical amplifier that includes an optical channel monitor (OCM) is obtained by introducing a notch into the amplified spontaneous emission (ASE) noise spectrum of the amplifier outside a WDM transmission band, and having the OCM detect the notch and use the notch as a reference to calibrate the wavelength measurement. The notch is introduced into the ASE noise spectrum using a notch filter, which is preferably incorporated in a gain flattening filter (GFF).

Efficient wavelength referencing in a combined optical amplifier-optical channel monitor apparatus

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Elad, Israel

Tomer Eliyahu