PRODUCTS – FIBRE OPTICS – ERBIUM DOPED
FIBRE AMPLIFIER
The Benchmark ETS is an EDFA (Erbium Doped Fibre Amplifier)
Training System. Erbium Doped Fibre Amplifier (EDFA) is an
optical amplifier that amplifies optical signals sufficiently
enough to cover several tens of kilometers
without any need for conventional repeaters. Moreover,
as it works in the same optical domain, it avoids
the need for several stages of signal conversion with
their associated problems. Consequently, EDFA
finds extensive use in the fibre backbone.
The Benchmark ETS – EDFA Training System –
addresses the need for a training setup that shows the
building blocks of a typical EDFA as well as the characteristics
of such blocks. All the blocks are given
with proper input and output connections such that
they can be configured in different modes of operation,
such as co-directional and counter-directional
operations. This modular approach also facilitates
study of individual block characteristics wherever
possible.
| Experiment Topics |
- Understanding the operating principles of EDFA
- Working of EDFA in Co-Directional, Counter-Directional Pumping
- Gain
- Power Conversion Efficiency
- Quantum Conversion Efficiency
- ASE-ASE noise, Signal-ASE Beat Noise
|
- Understanding the EDFA Building blocks
- Wavelength Selective couplers – 980nm/1550nm
- Tap coupler for 980nm – 99:1
- Optical Isolators – 1550nm
- Optical Circulators
- Fibre Bragg Grating (FBG)
- Optical attenuator – 1550nm
|
- Characteristics study of EDF
- Measurement of Absorption Co-efficient
- Mode field diameter mismatch in EDF
|
- Characteristics study of Pump Laser 980nm
|
- Characteristics study of Signal DFB Laser 1550nm
(Module 001 required)
- I-P Curve
- Knee Current
- Spectrum [Optical Spectrum Analyser (OSA) also required]
|
- Factors contributing to EDFA Gain – Pump Laser power,
length of Erbium Doped Fibre (Module 001 required)
- Large and small I/P signal Vs Gain
- Pump laser power Vs Gain
- EDF length Vs Gain
- Pump saturation
- Signal saturation
|
- Setting up a Fibre Optic link with EDFA
- 1550nm, 34Mbps Data rate (Module 001 required)
- Setting up a digital link (using the Benchmark OFT)
|
- Fibre Ring laser (OSA required)
|
- Noise Figure measurement (OSA required)
|
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| Specifications |
 |
Pump Laser |
|
|
|
Wavelength |
|
980nm |
| |
Output power |
|
160mW (typ) |
| |
Output power – adjustable |
|
1µW to 100mW |
| |
|
|
|
| |
DFB Signal Laser |
|
|
| |
Wavelength |
|
1550nm |
| |
Output power |
|
1mW (typ) |
| |
SMSR |
|
>30dB |
| |
|
|
|
| |
EDF |
|
|
| |
C-Band single mode fibre |
|
|
| |
Max data rate |
|
2 Mbits/sec (NRZ) |
|
Peak absorption near 1530nm |
|
6.0 ±1dB/m |
| |
Peak absorption near 980nm |
|
≥ 3.0dB/m |
| |
Second mode cutoff |
|
920nm ±50nm |
| |
|
|
|
| |
Optical Isolator |
|
|
| |
Operating wavelength |
|
1550nm±1dB/m |
| |
Isolation |
|
≥ 3.0dB/m |
| |
Insertion loss |
|
920nm ±50nm |
| |
|
|
|
| |
Wavelength selective coupler (WDM) |
| |
Operating wavelength |
|
|
| |
Isolation |
|
19dB (typ) |
| |
Insertion loss |
|
1dB (typ) |
| |
|
|
|
| |
Optical Circulator |
|
|
| |
Number of ports |
|
3 |
| |
Operating wavelength |
|
1530-1570nm |
| |
Isolation |
|
35dB (typ) |
| |
Insertion loss |
|
1dB (typ) |
| |
|
|
|
| |
Fibre Bragg Grating |
|
|
| |
Bandwidth |
|
20nm |
| |
Reflectivity |
|
90% – 95% (typ) |
| |
|
|
|
|
*Specifications subject
to change without notice
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For more information / downloads follow the links in the right-hand panel
