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Hybrid Raman-EDFA

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Description

Hybrid Raman-EDFA

F-tone's Hybrid Raman-EDFA module enables cost-effective deployment of ultra-long haul networks as well as the extension of existing long-haul, regional and metro networks, without the need for 3R O-E-O regeneration. The Hybrid module consists of a counter-propagating Raman pump unit and a variable gain (VG) EDFA. These two elements are integrated to provide exceptionally low noise figure and excellent gain flatness - two imperative parameters for ultra-long haul systems. The module can support up to 3 Raman/EDFA pumps in various configurations.

Since the module¡¯s first stage is a Raman pre-amplifier which has a negative effective noise figure, the overall combination of the Raman pre-amplifier and VG EDFA has a very low effective noise figure. This allows the link reach to be extended 3 to 4 times, in comparison to a system based on traditional EDFAs. The Hybrid control circuitry operates in advanced AGC mode, in which the actual Raman gain is automatically measured and then complemented using the EDFA gain. The required total gain is therefore constantly maintained. This fast AGC control circuitry also provides excellent transient suppression, allowing the amplifier to keep the gain constant also in cases where there are fast and large changes in the input power (regardless of ASE produced by the Raman pump).

The module also incorporates laser safety mechanisms, ensuring that both the Hybrid Raman-EDFA module itself and the network in which it is installed can be classified as Class 1M products with respect to laser safety.

Features

  • Integrated Raman and EDFA design with unified gain control
  • Supports up to 3 14xx nm Raman and 980 nm EDFA pumps in various configurations
  • Variable gain operation with dynamic range of up to 17 dB
  • Exceptionally low effective noise figure for all gain values
  • Superior gain flatness regardless of fiber type and fiber loss
  • Eye safety - Class 1M 
  • RS232 or I2C communication protocols

Applications

  • Extending metro, regional, LH and ULH WDM links (3000 km and beyond)
  • System upgrade to 40 Gb/s, 100 Gb/s, and coherent detection
  • Link extension beyond 1000 km without adding 3R O-E-O sites
  • In-line and pre-amplifier applications
  • OSNR-sensitive applications

Specifications

Specification

Unit

Min.

Max.

Remarks

Wavelength Bandwidth nm  1528 1567  
Input Power Range dBm -35 +11 Other input power ranges can be specified
Saturated Output Power dBm 21    
Gain Range dB 15 40 Any 17 dB dynamic range can be selected for 3-pump design
Noise Figure 2-pump
3-pump
G>=24
G>=28
dB   1
0
For G.652 fiber, depends on dynamic gain range
Gain Flatness Peak-Peak   dB   0.7 Including Raman gain
Gain Setting Accuracy   dB -0.5 +0.5 Including Raman gain
Transient Overshoot/Undershoot dB    ¡À1 Up to 19 dB add/drop
Transient Setting Time ms   400 Up to 19 dB add/drop
PDG + PDL dB   0.35  
Mechanical Dimensions 2-pump
3-pump
mm 125x200x16
140x200x24
Without heat sink
Power Consumption 2-pump
3-pump
W   32
45
 

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