Link-control gain clamping for a cascaded EDFAs link using differential ASE monitor

Abstract

We propose a novel scheme for the suppression of gain excursion in a cascaded erbium-doped fiber amplifiers (EDFAs) link. By applying the differential amplified spontaneous emission monitoring method on link-control gain clamping, it is possible to achieve gain clamping for the whole link irrespectively of the control-signal wavelength and characteristics of individual amplifiers. The suggested algorithm/circuitry does not require predefinition of the injected signal power and operates independently of the wavelengths of control/data signals to the EDFA, enabling its application to different amplified links under distinct design parameters.

Dynamic-performance characterization of C-band EDFA using ASE-power peak-selective feedback gain-clamping

“…In recent years, the EDFA with gain flattened and gain clamped have shown as a key component in WDM systems, particularly, in dense WDM (DWDM) sys tems. There are three gain clamped methods for opti cal fiber amplifiers: (1) using electro optical feedback in pumping source to compensate the gain fluctuation [5,[13][14][15][16][17][18]; (2) by putting an additional compensation signal [6,12,19,20]; (3) by adding a resonant cavity to compensate the gain fluctuation [2,[21][22][23][24][25][26][27][28][29][30][31][32]. However, the first method depends on the speed of optoelec tronics components, but it still has a time delay prob 1 The article is published in the original.…”