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RFA5208 C-Band Separate Raman Fiber Amplifier
Category: Fiber Amplifier  Publish Time: 2014-06-25 20:05 

RFA5208 C-Band Separate Raman Fiber Amplifier
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RFA5208 C-Band Separate Raman Fiber Amplifier 

Description
a. 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 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 1300~1600 nm.
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. Idealphotonics RFA distributed Raman Amplifier is a series of products, with different Raman Gain and Gain bandwidth to meet differential needs. The unit adopts Japanese Fitel Raman pump laser, built-in perfect laser APC, AGC, ATC closed-looped circuit ensuring long life and stable operation of the pump laser.

Applications
 Fiber CATV system, extra-long trunk that is inconvenient for building relay station.
 Relay distance > 60Km.
 Single span distance > 80Km.
 DWDM, CATV extra-long trunk optical transmission system.
 Submarine optical transmission system.
Features
 Low noise figure and flat gain.
 Adopts famous Fitel Raman pump laser.
 Gain bandwidth: C-Band (1528~1563nm.

Specification

Performance

Min

Typ

Max

Supplement

Optic feature

Wavelength

(nm)

1528

 

1563

RFA5200     C-Band

Pump optic transmission power

(mW)

400

 

 

 

Raman switch gain

(dB)

5.5

6

7

RFA5206

7

8

9

RFA5208

9

10

11

RFA5210

11

12

13

RFA5212

13

14

15

RFA5214

15

16

16.5

RFA5216

Gain flatness

(dB)

 

1.0

 

RFA5200/F (With GFF)

 

2.0

 

RFA5200 (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

()

0

 

60

 

Relative 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 )

 

 

Notes: 
work wavelength and pumping optical power can be tailored according to the customer's request

Product series

Model

Work wavelength (nm)

Gain flatness (dB)

Raman Switch gain (dB)

RFA5206/0

1528~1563

<±2

6 (-0.5 ~ +1)

RFA5208/0

1528~1563

<±2

8±1.0

RFA5210/0

1528~1563

<±2

10±1.0

RFA5212/0

1528~1563

<±2

12±1.0

RFA5214/0

1528~1563

<±2

14±1.0

RFA5216/0

1528~1563

<±2

16 (-1 ~ +0.5)

RFA5206/F

1528~1563

<±1.0

6 (-0.5 ~ +1)

RFA5208/F

1528~1563

<±1.0

8±1.0

RFA5210/F

1528~1563

<±1.0

10±1.0

RFA5212/F

1528~1563

<±1.0

12±1.0

RFA5214/F

1528~1563

<±1.0

14±1.0

RFA5216/F

1528~1563

<±1.0

16 (-1 ~ +0.5)

Notes:
 1. Distributed optical reman amplifier with opposite phase PUMP ( phasing back PUMP).2. F model, built-in gain flatness filter GFF.
Ordering information

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