Hybrid amplifier EDFA + RAMAN
• reduction of the effective noise factor of the amplifier
• increase in signal transmission rate due to less impact of low noise factor on more complex modulation forms
• increasing the distance between amplifying nodes and lower network operating costs
The hybrid amplifier consists of a counter-pumped Raman stage and an erbium amplifier.
Raman amplification of the signal occurs in the fiber line before entering the erbium amplifier.
This achieves a reduction in the noise level in the receiver and an increase in the quality of the received signal.
Reducing the noise level makes possible to increase the distance between the amplifying nodes, the range of non-regeneration transmission, as well as reduce the cost of network operation and increase the throughput of the operated communication lines through the use of multi-level formats with high spectral efficiency.
A configuration with intersectional access is possible for the connection of dispersion compensators.
Parameter ROADM | RA | EA |
Spectral range | 1528.7 – 1567.1 nm | |
Output power | +28 dBm | +16...+23 dBm |
Number of amplifying stages | – | 1 – 2 |
Number of leveling GFF filters | – | 1 – 2 |
Spectral flatness per 10 dB of amplification | – | ≤ 0.5 dB |
Power adjustment range with an attenuator | 6 – 10 | 11 – 18, 14 – 24, 20 – 35 |