Optical Cable Identifier K-200

Finds the one cable you want inside a manhole or duct full of identical ones: tap the cable, and the K-200 turns the knock into a tone and a bar reading — nothing is cut, bent or frozen.

Non-invasive identification: the photo-elastic effect turns a gentle tap on the target cable into audio and visual signals — the fiber is never cut, bent or frozen, and live traffic on it is untouched
Two reaches: 40 km and 100 km versions, working over a single fiber at 1550 nm, with no initial blind zone
Reads by ear and by eye: the sound tracks how hard the cable is knocked, while the screen shows a bar chart or ECG trace — usable in a noisy street cabinet or a quiet plant room
Works with PC, APC or cut fiber ends, and in manholes, tunnels, conduits and aerial spans alike
5.6-inch touch screen plus buttons, ten hours or more on the built-in lithium battery, 1.5 kg complete

40 km version100 km version

Ask for Pricing WhatsApp K-200 Datasheet (PDF)

Checked before it ships

Functions verified against the ordered version before dispatch — the version table on this page is the exact build list.

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Your brand on it

Neutral instrument branding as standard; labeling per order.

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Stock & small lots

Instruments are supplied to the version you order; tell us the work and we will help you spec it.

Specifications

K-200 full specification

Test method	Single fiber
Wavelength	1550 nm
Fiber type	Single-mode
Maximum test distance	40 km or 100 km (by version)
Unidirectional fiber loss	10 dB (40 km version); 30 dB (100 km version)
Initial blind zone	None
Fiber-end return loss requirement	≤40 dB (40 km version); ≤20 dB (100 km version)
SNR	≥25 dB
Optic connector	FC/APC
Display	5.6 in LCD touch screen
Input	Touch screen + buttons
Output	Visual: bar chart or ECG display; Audio: sound tracking the knock intensity
Battery	Lithium 7.4 V, 10.4 Ah — ≥10 h continuous work
Power consumption	<6 W
Power supply	DC 12 V / 3 A
Dimensions	65 × 150 × 235 mm
Weight	1.5 kg (including battery)
Working temperature	0 °C to +45 °C
Storage temperature	-20 °C to +55 °C

One K-200 optical cable identifier (version as ordered)Soft carry bagEarphonesDC power adapter

In the box: the parts above, packed per unit. Applications: Picking the target cable out of a crowded manhole, duct or tunnel run before cutting or splicing · Verifying cable identity where records are wrong or labels are missing · Aerial, conduit and buried routes where several operators' cables share the path · Pre-work confirmation on live cables that cannot be interrupted for identification.

How tap-and-listen cable identification works

Records lie and labels fall off; a duct can hold a dozen cables that all look the same. The old ways of proving which is which — cutting, bending or freezing the fiber — interrupt service and can damage the cable. The K-200 works differently: a coherent 1550 nm signal is launched into the fiber at one end, and when the cable is tapped, the mechanical disturbance changes the light through the photo-elastic effect. The instrument reads that disturbance and plays it back as sound and as a bar or ECG trace.

In practice one technician connects the identifier at the accessible end and a second walks the route, tapping each candidate cable. On the wrong cables the screen stays flat and the earpiece stays silent; on the target cable every tap answers back, louder the harder the knock. Because nothing about the fiber is disturbed, the method works on live cables — even while the fiber is under cut or splicing conditions — and the identification holds over 40 km or 100 km of route depending on the version.

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