Technology Labs
FOL-EDFA: Erbium Doped Fiber Amplifier Module
1) EDFA System enables student to experimentally investigate the principles and characteristics of EDFA in C Band (1530nm ~ 1565nm)
2) Demonstrates amplification of 1550 nm wavelength along with the detection and measurement of amplified signal
3) Investigation and Analysis of Small and Large Signal Gain
4) Facility to implement Forward and Backward Pumping and Study Gain Characteristics
EDFA Block Diagram
1) 1550nm signal and 980nm pumped inside EDF
2) 2:1 WDM system is used to combine pump and optical signal (1550nm)
3) The Erbium atoms absorb 980nm pump signal and jump to higher energy state
4) 1550nm strikes excited Er+3 ions and initiate Stimulated Emission
5) 1550nm amplified by stimulated emission
Amplification Principle
1) The figure describe energy level diagram for Er+3 ion
2) 1480 nm pump excites Er+3 to quasi metastable stage
3) Coincidently, emits wavelengths in the range 1525-1565nm range while returning back to ground state from quasi-metastable stage
4) This amplifies the signal by stimulated emission.
2) Demonstrates amplification of 1550 nm wavelength along with the detection and measurement of amplified signal
3) Investigation and Analysis of Small and Large Signal Gain
4) Facility to implement Forward and Backward Pumping and Study Gain Characteristics
EDFA Block Diagram
1) 1550nm signal and 980nm pumped inside EDF
2) 2:1 WDM system is used to combine pump and optical signal (1550nm)
3) The Erbium atoms absorb 980nm pump signal and jump to higher energy state
4) 1550nm strikes excited Er+3 ions and initiate Stimulated Emission
5) 1550nm amplified by stimulated emission
Amplification Principle
1) The figure describe energy level diagram for Er+3 ion
2) 1480 nm pump excites Er+3 to quasi metastable stage
3) Coincidently, emits wavelengths in the range 1525-1565nm range while returning back to ground state from quasi-metastable stage
4) This amplifies the signal by stimulated emission.
1) LASERS @1550nm
i) 1.25 Gbps Laser Diode Module at wavelength of 1550nm
ii) In built Isolator
iii) Channel Spacing : 20 nm
iv) Threshold Current Ith : 10 mA Typical
v) Output Power : @ Ith + 30 mA - > 0.7 mW @ ~ 58 mA-> 1.4 mW
vi) Operating Voltage : 1.1V Typical
2) PUMP LASER@974nm
i) Up to 100 / 150mW TEC Control 980nm Pump Module
ii) Maximum Operating Power : 100 mW
iii) Maximum Operating Current : 340mA
iv) Center Wavelength : 974nm +-2
v) Optical Connector : SC/APC
3) Optical Detector
i) 1.5 GHz InGaAs PIN Photodiode Module
ii) Responsivity : Typical 0.9 A/W in 9/125 μmfiber
iii) Spectral Range : 1250nm to 1600nm
iv) Reverse Voltage : 30 V max.
v) Optical Connector : SC/APC
4) Wavelength Division Multiplexer
i) Operating Wavelength(nm) : 974/1550Max.
ii) Insertion Loss (dB) : 0.20
iii) Isolation (dB) : >20
iv) Polarization Sensitivity(dB) : <0.05
5) Erbium Doped Fiber
i) The core of the fiber is doped with Erbium.
ii) In EDF fiber core acts as gain medium or Host
iii) MFD (Nominal) : 5.5 - 6.3um@1550nm
iv) Core NA : 0.21 - 0.24
v) Cut - off Wavelength : 900 - 940nm
vi) C-Band Single Mode Fiber : (1530 - 1565nm)
vii) Peak Absorption : 4.5-5.5 dB/m@980nm 5.4-7.1 dB/m@1531nm
6) Software
i) User friendly GUI for monitoring, controlling of EDFA system
ii) Operating modes like CW mode, VI characteristics mode, Internal & External Modulation
iii) LASER control like Supply ON/OFF, wavelength selection and driving current selection
iv) Real time signal level monitoring of Photo-detector
v) Graphical representation : XY plot of VI characteristics and Internal Modulation
vi) COM Settings : USB 2.0
Software Interface
A) VI Characterisation of Pump and Laser Source
i) Above picture shows the VI characteristics of pump and source LASER.
ii) VI characteristics of both LASERs could be observed in the software by selecting VI characteristics in the Operating Mode option.
B) LASER CONTROLS
i) Individual LASER voltage can be controlled using slider provided in software
ii) LASER voltage and corresponding LASER current is displayed on the screen
C) MODULATION MODE
i) LASER voltage controls provided
ii) Select LASER on Left column
iii) Internal and External modulation options available
iv) 4 Modulation frequencies (100Hz, 200Hz, 500Hz, 1KHz) can be used
v) Modulated signals displayed on graph in right column
D) OPTICAL SPECTRUM ANALYZER DISPLAY
i) Output Spectrum of EDF with Signal Source (1550nm)
ACCESSORIES
i) Shielded USB A-A cable : 01No
ii) Power Cable : 01No
iii) SC-SC Single Mode Fiber Optic Patch Chords : 06No
iv) BNC to BNC coaxial cable : 01No
v) Software on CD : 01No
vi) FTDI Drivers
vii) Experimental Manual : 01No
i) 1.25 Gbps Laser Diode Module at wavelength of 1550nm
ii) In built Isolator
iii) Channel Spacing : 20 nm
iv) Threshold Current Ith : 10 mA Typical
v) Output Power : @ Ith + 30 mA - > 0.7 mW @ ~ 58 mA-> 1.4 mW
vi) Operating Voltage : 1.1V Typical
2) PUMP LASER@974nm
i) Up to 100 / 150mW TEC Control 980nm Pump Module
ii) Maximum Operating Power : 100 mW
iii) Maximum Operating Current : 340mA
iv) Center Wavelength : 974nm +-2
v) Optical Connector : SC/APC
3) Optical Detector
i) 1.5 GHz InGaAs PIN Photodiode Module
ii) Responsivity : Typical 0.9 A/W in 9/125 μmfiber
iii) Spectral Range : 1250nm to 1600nm
iv) Reverse Voltage : 30 V max.
v) Optical Connector : SC/APC
4) Wavelength Division Multiplexer
i) Operating Wavelength(nm) : 974/1550Max.
ii) Insertion Loss (dB) : 0.20
iii) Isolation (dB) : >20
iv) Polarization Sensitivity(dB) : <0.05
5) Erbium Doped Fiber
i) The core of the fiber is doped with Erbium.
ii) In EDF fiber core acts as gain medium or Host
iii) MFD (Nominal) : 5.5 - 6.3um@1550nm
iv) Core NA : 0.21 - 0.24
v) Cut - off Wavelength : 900 - 940nm
vi) C-Band Single Mode Fiber : (1530 - 1565nm)
vii) Peak Absorption : 4.5-5.5 dB/m@980nm 5.4-7.1 dB/m@1531nm
6) Software
i) User friendly GUI for monitoring, controlling of EDFA system
ii) Operating modes like CW mode, VI characteristics mode, Internal & External Modulation
iii) LASER control like Supply ON/OFF, wavelength selection and driving current selection
iv) Real time signal level monitoring of Photo-detector
v) Graphical representation : XY plot of VI characteristics and Internal Modulation
vi) COM Settings : USB 2.0
Software Interface
A) VI Characterisation of Pump and Laser Source
i) Above picture shows the VI characteristics of pump and source LASER.
ii) VI characteristics of both LASERs could be observed in the software by selecting VI characteristics in the Operating Mode option.
B) LASER CONTROLS
i) Individual LASER voltage can be controlled using slider provided in software
ii) LASER voltage and corresponding LASER current is displayed on the screen
C) MODULATION MODE
i) LASER voltage controls provided
ii) Select LASER on Left column
iii) Internal and External modulation options available
iv) 4 Modulation frequencies (100Hz, 200Hz, 500Hz, 1KHz) can be used
v) Modulated signals displayed on graph in right column
D) OPTICAL SPECTRUM ANALYZER DISPLAY
i) Output Spectrum of EDF with Signal Source (1550nm)
ACCESSORIES
i) Shielded USB A-A cable : 01No
ii) Power Cable : 01No
iii) SC-SC Single Mode Fiber Optic Patch Chords : 06No
iv) BNC to BNC coaxial cable : 01No
v) Software on CD : 01No
vi) FTDI Drivers
vii) Experimental Manual : 01No
1) Measuring Small-Signal Gain
2) Measuring Gain Saturation
3) Measuring Saturation Output Power
4) Measuring Pump Saturation
5) Measurements under Modulation
6) Implementation of Forward Pumping and Backward Pumping
2) Measuring Gain Saturation
3) Measuring Saturation Output Power
4) Measuring Pump Saturation
5) Measurements under Modulation
6) Implementation of Forward Pumping and Backward Pumping
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