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Mode Characteristics in Fiber Optics Manufacturer,Supplier and Exporter in India

Product Code : SCL-EELE-13252

Indian Lab Suppliers supplies the Mode Characteristics in Fiber Optics (Product ID: 13252) as part of its electronics engineering lab equipment range. It is an optical-bench set-up for measuring numerical aperture and V number, and for viewing mode patterns, in single-mode and multimode fibres.

Quick Answer

The normalised frequency V = 2πa·NA/λ decides how many modes a fibre guides: below 2.405 only the fundamental mode propagates, above it higher modes appear. Students launch a 650 nm, 2 mW laser into a 9 µm glass fibre (NA 0.13, single-mode at 1300–1600 nm) and a 1000 µm plastic fibre (NA about 0.5), measure NA on the screen and compare the mode patterns. At 650 nm the 9 µm fibre has V of roughly 5.6, so a few modes show. The laser is described as He-Ne, yet He-Ne lasers emit at 632.8 nm, not 650 nm; please confirm the laser type at quotation. Never look into the laser or a lit fibre end.

Key Specifications

Parameter	Detail
Laser	650 nm, 2 mW, with mounting stand and fibre coupler (type to be confirmed)
Laser-to-fibre coupler	Coupling efficiency >70% single-mode, >90% multimode
Single-mode fibre	Step-index glass, 9 µm core, NA 0.13, 1300–1600 nm, SMA, 1 m
Multimode fibre	Step-index POF, 1000 µm core, index 1.49 / 1.42, NA about 0.5, SMA, 1 m
Mechanics	Optics bench with fibre coupling assembly, NA / mode observation screen with holder, 6-inch scale
Power	110–220 V ±10%, 50/60 Hz, about 10 VA
Dimensions	Laser 95 × 110 × 355 mm; bench 40 × 75 × 500 mm; about 4 kg