What is the difference between EYDFA and EDFA?

EYDFA and EDFA are both optical fiber amplifier, but they are quite different in structure, performance, and application scenarios. Below let’s expose them one by one.

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EYDFA Fiber Amplifier
32 port high power radio and television 1550nm erbium ytterbium fiber amplifier edfa for optical communication network, without wdm
EDFA Fiber Amplifier

Differences in structure and working principle

Characteristic‌EYDFA‌EDFA
Doped elementEr ³ ⁺+Yb ³ ⁺ co doped fiberSingle erbium ion (Er ³ ⁺) doping
pumping methodDouble clad structure, supporting multi-mode pump lasersSingle mode fiber core pump, relying on high cost single-mode pump source
Energy transferYtterbium ions absorb pump light energy and efficiently transfer it to erbium ionsErbium ions directly absorb pump energy

Performance parameter comparison

1. Output power and efficiency

EYDFA: Supports watt level output (27~35dBm), can replace 4~8 EDFAs with a single unit, and improves pump conversion efficiency by more than 10%;

EDFA: Typical output<27dBm (single-mode), significant degradation of noise index during cascaded amplification.

2. Gain and noise characteristics

EYDFA: The gain bandwidth covers 1530~1565nm (C-band), with better gain flatness and a noise figure comparable to EDFA (about 5.5dB);

EDFA: The gain bandwidth is similar, but the cumulative noise increases and CNR deteriorates when cascaded over long distances.

3. Nonlinear effect suppression

EYDFA requires optimized heat dissipation design due to high power output, but the double clad structure can reduce the risk of nonlinear scattering.

Application scenario differentiation

sceneAdvantages of EYDFAApplicability of EDFA
Fiber to the Home (FTTH) in Cable TVSingle input multiple output (such as 8 × 23dBm), saving backbone fiber resourcesCascading is required, occupying more fiber ports
Ultra long distance transmissionExtension of relay free transmission distance by 50% to 100%Multiple levels of relay are required, resulting in increased cost and complexity
Dense Wavelength Division Multiplexing (DWDM)High power supports more channels, reducing unit channel costsOutput power bottleneck limits channel capacity

Cost and operational impact

  • Construction cost: EYDFA has a higher unit price, but at the system level, it can reduce the number of amplifiers and fiber occupation, resulting in a comprehensive cost reduction of over 30%;
  • Operational complexity: EYDFA reduces node failure rate, making fault localization in EDFA cascade systems more difficult.

Technical selection suggestions

  • High density user areas (such as FTTH): EYDFA is preferred to achieve single point high-power coverage;
  • Short distance low-power scenario: EDFA is more flexible due to its modular packaging.
  • Balance power demand, fiber optic resources, and long-term operation and maintenance costs.
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