Single Mode Fibre Characteristics

The SMC Trainer – The Ultimate Single Mode Fibre Characteristics Training System

The light propagation in optical fibres is well understood by way of explaining the ray propagation with respect to angle of light coupled into fibre and reflections at the core-cladding boundary. But a complete description of the modes is rather complex as it involves hybrid electromagnetic fields. The wave nature of electromagnetic radiation when guided, such as microwaves in a wave-guide or light in an optical fibre, results in phase shifts of the wavefronts at the reflective boundaries that reinforce the transmission in discrete number of paths or modes.

The Benchmark SMC Trainer provides a platform to show the propagating modes in a single mode fibre.

Features

Enables comprehensive training on Single-mode fibre characteristics such as Normalized Frequency (Vnumber), Modes, cut off wavelength, Mode field diameter and Numerical aperture of a single mode fibre
Modes observation in two different single mode fibres having different cut off wavelengths
Precision XYZ positioner for coupling the free space 650nm Laser light into Single-mode fibre
Specially designed Mechanical setup for Mode field diameter and NA measurement
Comprehensive lab manual

Experiment Topics

Normalized frequency (V-number) calculation and Modes observation in two different single mode fibres
Mode field diameter & NA measurement of single mode fibre


LP01	LP11	LP22	LP02

Specifications

SST-ST-PC-3-A
Cut-off wavelength	1260nm
Numerical aperture	0.12
Mode field diameter	9.2nm@1310nm 10.4nm@1550nm
SST-ST-PC-3-C
Cut-off wavelength	600nm
Numerical aperture	0.12
Mode field diameter	4.3nm@633nm 4.6@680nm
ST-PC-3
Core diameter	50μm
Numerical aperture	0.2
Rotation stage
Maximum angle of rotation	±10°
Angle steps	0.5° (approx)
Power Meter
Sensor type	Large area Si Photodetector
Optical input wavelength	600 – 1000 nm
Optical input power	-60 dBm to +3 dBm
Photodetector sensor area	3.8 x 3.8 mm
LD Unit
Source	LD
Lasing Wavelength	650nm (typ)
Threshold current	30mA (typ)
Maximum current	55mA
Optical output connector	Collimating lens
Optical output Power	3mW (max)
LD Driver
Possible modes of Operation	Forward bias
Bias Control	Potentiometer
Power supply connectors	DIN – DIN cable
Reflectivity	90% – 95% (typ)
LD unit Interface connector	5x2 Header

*Specifications subject to change without notice

List of Items

FOSM-D600 LD Driver	-	1 no
FOSM-U600 LD Unit	-	1 no
Fibre Optic power meter with remote PD	-	1 no
Rotation Stage with mounting post & XYZ positioner setup	-	1 no
XYZ positioner with mounting post setup Single mode & multimode patch cords	-	1 no
SST-ST-PC-3-A	-	1 no
SST-ST-PC-3-C	-	1 no
ST-PC-3	-	1 no

Ordering Information

SMC trainer