Optical Light Source K-528
A high-stability FP-LD light source for loss testing and fiber identification: 1310/1550 nm single-mode at −7 dBm (850/1300 nm multimode build available), CW or 270/1000/2000 Hz modulation, and 45 hours of work on three AA batteries.
Typical work: Link and splitter loss measurement with an optical power meter — the K-527 is its matched meter; Fiber identification by tone: the 270/1000/2000 Hz modulation is picked up at the far end; Telecom and CATV engineering, construction and maintenance; Structured cabling installation and acceptance testing; Laboratory and training setups that need a stable reference source.
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Neutral stock in small lots, or private label made to your requirements. Prices on request — EXW factory pricing.
K-528 key features
- Two builds cover the plant: 1310/1550 nm single-mode at −7 dBm output for FTTH, access and trunk work, or 850/1300 nm multimode at −20 dBm for premises and LAN fiber
- CW or modulated: run continuous wave for power and loss readings, or switch to a 270 / 1000 / 2000 Hz tone so the far end can identify your fiber with a power meter or an identifier — without disconnecting anything
- High-stability FP-LD output: wavelength and output power hold steady through a measurement run, which is what makes a loss figure repeatable from one visit to the next
- Everything on the LCD: working wavelength and modulation state on one backlit display, switched with the λ and MODE keys — no guessing what the source is sending
- Optional VFL on the same unit: the VFL key drives a built-in visual fault locator (build option), so one handheld launches the test signal and finds the visible fault
- 45 hours on three AA batteries, with auto-off for cabinet work; the metal dust cap rides on its chain so the FC port stays clean between jobs
K-528 specifications
| Wavelengths | 1310/1550 nm (single-mode build); 850/1300 nm (multimode build) |
|---|---|
| Emitter | FP-LD laser |
| Output power | −7 dBm (1310/1550 nm); −20 dBm (850/1300 nm) |
| Modulation | CW / 270 Hz / 1 kHz / 2 kHz |
| Fiber type | Single-mode or multimode, by build |
| Connector | FC/PC |
| Display | Backlit LCD showing wavelength and modulation state |
| Power supply | 3 × AA batteries |
| Battery life | 45 hours |
| Operating temperature | −10 °C to +50 °C |
| Storage temperature | −20 °C to +70 °C |
| Weight | 250 g |
| Dimensions | — |
The other half of a loss measurement
A power meter alone can only say how much light arrived. To turn that into the loss of a link, you need a known, stable launch at the far end — that is the light source's job. The K-528 holds its output steady at −7 dBm on 1310/1550 nm, the meter reads what is left at the far end, and the difference is the link loss you sign off.
The modulation tones do a second job: set 270, 1000 or 2000 Hz and the tone travels with the light, so a technician at the far end can prove which fiber in a bundle is the one connected to the source — without disconnecting anything.
Compare the fiber test equipment range
Every product in this category, side by side on the figures that decide the choice. Blank cells mean the figure is not stated in our current data — ask us and we will confirm it for the model you mean.
| K-800PON | K-V30 | K-350 | K-340 | K-535 | K-527 | K-528 | K-V10 | K-PV1 | |
|---|---|---|---|---|---|---|---|---|---|
| Wavelength | — | 650 nm (visible red) | — | — | — | — | — | 650 ± 10 nm (visible red) | — |
| Wavelengths | — | — | — | — | — | — | 1310/1550 nm (single-mode build); 850/1300 nm (multimode build) | — | — |
| Dynamic range | 34/32 dB (1310/1550 nm); 44 dB (1625 nm) | — | — | — | — | — | — | — | — |
| Measurement range | 0.3–200 km | — | — | — | -70 to +6 dBm or -50 to +26 dBm (two versions) | -70 to +10 dBm | — | — | -70 to +10 dBm |
| Dimensions | 263 × 75 × 203 mm | 165 × 26 mm | 196 × 30.5 × 27 mm | 219 × 45 × 28 mm | 118 × 72 × 32 mm | — | — | 175 × 26 × 26 mm | — |
| Weight | 1.784 kg | 50 g | 200 g | 235 g | 150 g | — | 250 g | 53 g (excluding batteries) | — |
Where the K-528 works
Link and splitter loss measurement with an optical power meter — the K-527 is its matched meter
Part of the Fiber Test Equipment range — see the specifications above for the figures that matter on this work.
Fiber identification by tone: the 270/1000/2000 Hz modulation is picked up at the far end
Part of the Fiber Test Equipment range — see the specifications above for the figures that matter on this work.
Telecom and CATV engineering, construction and maintenance
Part of the Fiber Test Equipment range — see the specifications above for the figures that matter on this work.
Structured cabling installation and acceptance testing
Part of the Fiber Test Equipment range — see the specifications above for the figures that matter on this work.
Laboratory and training setups that need a stable reference source
Part of the Fiber Test Equipment range — see the specifications above for the figures that matter on this work.
K-528 components
- One K-528 optical light source
- User manual
Documents for this model
Product Catalog 2026 — this model appears in our full-range catalog (PDF), published in the Downloads center.
User manual — if you need the manual for this model now, ask via the inquiry form below or on WhatsApp and we will send the available documents with your quote.
More fiber test equipment
Questions about the K-528
Can the K-528 carry our own brand?
Private labeling is made to your requirements and confirmed per order — labels with your logo, part numbers and barcodes on the tools, the inner boxes and the outer cartons, ready for your warehouse. The products most often labeled are the K-35 cleaver, the KS-1 Kevlar shears and the K-870 stripper.
Can we order a small lot, unbranded?
Yes. Neutral stock is held for the core range: small lots are welcome, you can mix models in one shipment, and restock as you sell. Prices are on request — EXW factory pricing.
Ask for a quote — K-528
Tell us the quantity, and whether you want it neutral or with your brand on it.