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HRFA5000 Hybrid Raman/Er-doped Fiber Amplifier
Description
a. Erbium-doped Fiber Amplifier, due to 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 Fiber Amplifier (RFA) is a newly designed fiber amplifier
based on Stimulated Raman Scattering (SRS) effect. It 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 1300~1600nm.
b. 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. Its 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.
c. Low noise figure marks the super advantages as following:
①
During Single Mode Fiber(G.652) transmission, adopting Distributed Raman
Amplifier, it can reduce the loss for 5.5dB (Typical value) at effective
cross-distance. Compared with EDFA, it equals that the effective distance is
reduced for 25km, (fiber loss is calculated as 0.22dB/km). Therefore, the input
power to the fiber is reduced and the damage of fiber non-linearity effect
(SBS) is weakened.
② In
OSNR calculation, the Equivalent Noise Figure of distributed backward pump
Raman Amplifier is 0dB, typical value 0 ~ -2dB, which has remarkable help for
improvement of cross-band length, increase system OSNR and transmission
distance.
d. But Raman amplifier also has its disadvantages. Its gain is very low, not
exceed 16 dB in actual application. Although the noise figure of EDFA is
incomparable with Raman amplifier, its small signal gain can be higher that
30dBm. So the Raman amplifier is always combined with EDFA in system
application. Hybrid Raman Amplifier combined both the two amplifier is an idea
solution.
e. When an backward EDFA (If GP=10dBm, NF=5.5Db)
combines with one pre-distributed Raman Amplifier (if GP=10dB, NF=-0.5dB), the
gain of hybrid Raman amplifier (Raman + EDFA) will reach to GP=200Db and
NF=0.96dB.
f. Huatai HRFA5000 is a combination of RFA and EDFA to get flat Gain spectrum and high Optical Signal Noise Ratio (OSNR) . The un-relayed distance can be extended up to 30~50km and CNR can be improved for 4.5~6dB.
Applications
• Fiber CATV system,
extra-long trunk that is inconvenient for building relay station.
• Relay distance >
• Single span distance >
• DWDM, CATV extra-long trunk
optical transmission system.
• Submarine optical
transmission system
Features
• Perfect laser APC, AGC, ATC closed-looped circuit ensuring long life and stable operation of the pump laser.
• Low noise figure and flat gain.
• Adopts famous Fitel Raman pump laser.
• Different raman gain and EDFA output power optional ， be suitable for different network.
• Optimized structure, easy to use.
Specification
|
Performance |
Min |
Typ |
Max |
Supplement |
||
|
Optic feature |
Work wavelength |
(nm) |
1528 |
|
1563 |
HRFA5000 C-Band |
|
Pump optic transmission power |
(mW) |
400 |
|
|
|
|
|
Raman switch gain |
(dB) |
5.5 |
6 |
7 |
HRFA5206 |
|
|
7 |
8 |
9 |
HRFA5208 |
|||
|
9 |
10 |
11 |
HRFA5210 |
|||
|
11 |
12 |
13 |
HRFA5212 |
|||
|
13 |
14 |
15 |
HRFA5214 |
|||
|
15 |
16 |
16.5 |
HRFA5216 |
|||
|
EDFA gain |
(dB) |
10 |
|
|
|
|
|
EDFA output power |
(dB) |
13 |
|
|
|
|
|
Gain flatness |
(dB) |
|
1.0 |
|
HRFA5200 (With GFF) |
|
|
|
2.0 |
|
HRFA5200 (Without GFF) |
|||
|
Noise ratio |
(dB) |
|
|
4.5 |
|
|
|
Polarize mode dispersion |
(ps) |
|
|
0.2 |
|
|
|
Polarize related gain |
(dB) |
|
|
0.4 |
|
|
|
Polarize related loss |
(dB) |
|
0.1 |
|
|
|
|
General feature |
Work voltage |
(V) |
90 |
|
250 |
-48VDC optional |
|
Power Consume |
(W) |
|
30 |
|
|
|
|
Work temp |
(℃) |
0 |
|
60 |
|
|
|
Work humidity |
(℃) |
5 |
|
95 |
|
|
|
Storage temp |
(%) |
-40 |
|
+85 |
|
|
|
Size 1U (W)×(D)×(H) |
|
19×14.5×1.75 ( " ) 483×368×44 ( mm ) |
|
|||
|
Size 2U (W)×(D)×(H) |
|
19×14.5×3.5 ( " ) 483×368×89 ( mm ) |
|
|||
Product series
|
Model |
Work wavelength (nm) |
Gain flatness (dB) |
Raman Switch gain (dB) |
EDFA output power (dBm) |
|
HRFA5206-13 |
1528~1563 |
<±2 |
6 (-0.5～+1) |
>13dBm |
|
HRFA5208-13 |
1528~1563 |
<±2 |
8±1.0 |
>13dBm |
|
HRFA5210-13 |
1528~1563 |
<±2 |
10±1.0 |
>13dBm |
|
HRFA5212-13 |
1528~1563 |
<±2 |
12±1.0 |
>13dBm |
|
HRFA5214-13 |
1528~1563 |
<±2 |
14±1.0 |
>13dBm |
|
HRFA5216-13 |
1528~1563 |
<±2 |
16 (-1～+0.5) |
>13dBm |
|
HRFA5206-13/F |
1528~1563 |
<±1.0 |
6 (-0.5～+1) |
>13dBm |
|
HRFA5208-13/F |
1528~1563 |
<±1.0 |
8±1.0 |
>13dBm |
|
HRFA5210-13/F |
1528~1563 |
<±1.0 |
10±1.0 |
>13dBm |
|
HRFA5212-13/F |
1528~1563 |
<±1.0 |
12±1.0 |
>13dBm |
|
HRFA5214-13/F |
1528~1563 |
<±1.0 |
14±1.0 |
>13dBm |
|
HRFA5216-13/F |
1528~1563 |
<±1.0 |
16 (-1～+0.5) |
>13dBm |
2. F model, built-in gain flatness filter GFF.
3. F model, built-in gain flatness filter GFF.
4. F model, built-in gain flatness filter GFF.
Ordering information
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