EXCEPTIONAL SPECTRAL FLATNESS
WITH HIGH EFFICIENCY
the key to performance in
high channel-count DWDM EDFAs
IsoGain™ has a new core composition that delivers an exceptional gain profile in high channel-count DWDM EDFAs - maximising filtered gain and creating potential for unfiltered, high channel-count designs.
Gain Flatness that Exceeds the State-of-the-Art
IsoGain™ was pitted against market-leading fibers using a sophisticated computer simulation package. In a single-stage EDFA handling 32, simultaneous channels and pumped with 100 mW at 980 nm, IsoGain demonstrated gain-flatness of 0.6 dB - beating all other fibers by a significant margin.
Schematic of the Single-stage EDFA Used in the 32 Channel Simulation:
Simulation Parameters:
Pump
100mW at 980 nm
Fiber
12 metres IsoGain™ I6/980/125
Channels
32 simultaneous
Input Power
-20 dBm/channel
Wavelength Range
1536 nm to 1560.8
Channel Spacing
0.8 nm (ITU Grid)
2.1 dB Gain Flatness Indicated in a Dual Stage EDFA with No Gain Flattening Filter
A characteristic of any multi-stage EDFA is that the fundamental gain-shape of the fiber will be exaggerated. For this reason, gain flattening filters are used in all practical multi-stage designs. The following results illustrate what would happen if the GFF were omitted from a dual stage EDFA designed with IsoGain™. The resulting flatness of 2.1 dB from 1536 nm to 1560.8 nm is excellent - confirming that IsoGain's intrinsic spectrum is exceptionally flat.
Schematic of the Un-filtered, Dual-Stage EDFA Used in the 32 Channel Simulation:
Simulation Parameters:
Pump (Stage 1)
150 mW at 980 nm
Fiber (Stage 1)
13 metres IsoGain™ I6/980/125
Pump (Stage 2)
150 mW at 1480 nm
Fiber (Stage 2)
4 metres IsoGain™I6/980/125
Channels
32 simultaneous
Wavelength Range
1536 nm to 1560.8
Channel Spacing
0.8 nm (ITU Grid)
Fibercore Limited, Fibercore House, University Parkway, Chilworth Science Park, Southampton, Hampshire, SO16 7QQ, United Kingdom
Tel: +44 (0)23 8076 9893 | Fax: +44 (0)23 8076 9895 | Email: info@fibercore.com
