RFA4000
CATV Separate Optical Raman Amplifier
Product description
1. Erbium-doped Fiber Amplifier, due to the multiple cascades and the accumulation of noise caused by spontaneous emission, will reduce the system CNR greatly and thus it will limit the transmission capacity and distance of the system. Raman Amplifier is a newly designed fiber amplifier based on Stimulated Raman Scattering (SRS) effect. Raman amplifier is considered as the core technology of new generation DWDM fiber over-long communication. Compared with Erbium-Doped Fiber Amplifier, Raman amplifier has the advantage of low Noise Figure (NF), wider gain bandwidth, flexible gain spectral region and stable temperature. It is the only device that can operate in 1300~1600 nm.
2. The gain medium of EDFA is Erbium-doped Fiber (EDF). It is a separated amplifier and its signal light can only be amplified after putting into EDFA. The gain medium of Distributed Raman Amplifier is Single Mode Fiber (SMF) which is for signal light transmission. Raman amplifier gain area is distributed at long transmitting fiber that is 25km from the output end. That is to say, the signal light is amplified 25km before it reaches the output end of the transmitting fiber.
Product features
1. Perfect laser APC, AGC, ATC closed-looped circuit ensuring long life and stable operation of the pump laser.
2. Low noise figure and flat gain.
3. Adopts famous Fitel Raman pump laser.
4. Raman amplifier gain bandwidth: CATV (1540~1563nm).
Main application
1. Fiber CATV system, extra-long trunk that is inconvenient for building relay station.
Relay distance > 60Km.
Single span distance > 80Km.
2. DWDM, CATV extra-long trunk optical transmission system.
3. Submarine optical transmission system.
| Performance |
Min |
Typ |
Max |
Supplement |
| Optic feature |
Wavelength |
(nm) |
1540 |
|
1563 |
RFA4200 CATV |
| Pump optic transmission power |
(mW) |
400 |
|
|
|
| Raman switch gain |
(dB) |
5.5 |
6 |
7 |
RFA4206 |
| 7 |
8 |
9 |
RFA4208 |
| 9 |
10 |
11 |
RFA4210 |
| 11 |
12 |
13 |
RFA4212 |
| 13 |
14 |
15 |
RFA4214 |
| Gain flatness |
(dB) |
|
1.0 |
|
RFA4200/F (With GFF) |
| |
2.0 |
|
RFA4200 (Without GFF) |
| Noise figure |
(dB) |
|
|
0 |
|
| Polarize mode dispersion |
(ps) |
|
|
0.2 |
|
| Polarize related gain |
(dB) |
|
|
0.4 |
|
| Polarize related loss |
(dB) |
|
0.1 |
|
|
| General feature |
Work voltage |
(V) |
90 |
|
265 |
-48VDC optional |
| Power Consume |
(W) |
|
30 |
|
|
| Work temp |
(º C) |
0 |
|
60 |
|
| Relative humidity |
(º C) |
5 |
|
95 |
|
| Storage temp |
(%) |
-40 |
|
+85 |
|
| Size 1U |
(" ) |
19× 14.5× 1.75 |
(W)× (D)× (H) |
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