How to Choose a Fibre Optic Stable Light Source: NOVKER NK281 Buying Guide Malaysia

Choosing a fibre optic stable light source involves more than comparing prices. The buyer must match the instrument’s wavelengths, fibre type, optical connector and output characteristics to the actual testing application.

The NOVKER NK281 Stable Light Source is designed for fibre optic installation and maintenance. It also provides basic RJ45 network-cable testing functions, making it practical for contractors working with both optical fibre and copper Ethernet cabling.

Before ordering an NK281, use this guide to identify the correct configuration.

What Does a Stable Light Source Do?

A stable light source transmits a controlled optical signal through a fibre cable.

An optical power meter connected at the other end measures the received power. The technician compares the received value against a reference to determine the total insertion loss of the link.

This testing method is used for:

FTTH installation
Fibre optic network maintenance
Data centre cabling
Building backbone testing
Factory network inspection
Telecom work
Fibre patch-panel maintenance
Post-splicing verification

A stable light source is normally purchased as part of a test combination rather than as a standalone solution.

First Question: Single-Mode or Multimode Fibre?

The required fibre type determines the appropriate testing wavelengths.

Single-mode fibre

Single-mode fibre is commonly used for:

FTTH networks
Telecom systems
Building-to-building connections
Long-distance fibre links
Campus backbones
Factory network backbones

Frequently requested wavelengths include:

1310nm
1550nm

Some specialised applications may also require 1490nm or 1625nm.

Multimode fibre

Multimode fibre is commonly used for shorter internal network connections, including certain data centre and building applications.

Common testing wavelengths include:

850nm
1300nm

Do not purchase a 1310/1550nm-only model if the main requirement is to test multimode fibre at 850/1300nm.

Second Question: How Many Wavelengths Are Required?

Buyers should choose the wavelength combination based on their regular work.

Dual-wavelength configuration

A 1310/1550nm configuration is suitable for many contractors testing standard single-mode fibre.

It provides practical coverage for:

FTTH
Building fibre backbones
CCTV fibre transmission
General telecom maintenance
Point-to-point fibre links

Four-wavelength configuration

A four-wavelength unit may be appropriate when the customer regularly tests both single-mode and multimode fibre.

A possible combination could include:

850nm
1300nm
1310nm
1550nm

However, the exact wavelength combination must be confirmed with the supplier.

Do not pay for four wavelengths if the company only works with standard single-mode FTTH links.

Third Question: Which Optical Connector Is Used?

Common fibre optic connector types include:

The NK281 output-port configuration and included adaptors must match the customer’s test cords and installed network.

Also confirm whether the system uses:

UPC connectors
APC connectors

UPC and APC connectors must not be directly mated. Their polished end-face geometries are different, and an incorrect connection can create excessive loss and reflectance.

SC/APC connectors are commonly identified by a green housing, while SC/UPC connectors are commonly blue. Always confirm the actual specification instead of relying only on colour.

Fourth Question: Is an Optical Power Meter Included?

A stable light source cannot complete a loss test by itself.

A complete setup requires:

Stable light source
Optical power meter
Reference patch cords
Suitable adaptors
Fibre cleaning tools

Before purchasing, ask whether the quoted price covers:

NK281 only
NK281 with optical power meter
Complete loss-test kit
Carrying case
Adaptors
Patch cords
Charging accessories

Comparing an instrument-only price against a complete-kit price can be misleading.

Fifth Question: Does the Power Meter Support the Same Wavelengths?

The optical power meter must be compatible with the wavelengths transmitted by the NK281.

For example:

NK281 output	Power meter setting
850nm	850nm
1300nm	1300nm
1310nm	1310nm
1550nm	1550nm

Using the wrong wavelength setting can produce inaccurate readings because the power meter’s calibration response changes according to wavelength.

Sixth Question: Is the Equipment for Testing Live PON Signals?

A standard stable light source is used to inject a known signal into a controlled fibre link.

It is not automatically the correct instrument for measuring a live PON network carrying upstream and downstream signals.

For live PON measurements, the technician may require a suitable PON optical power meter capable of separating the relevant wavelengths.

The correct choice depends on the work:

NK281 plus standard optical power meter: End-to-end loss testing
PON power meter: Live PON signal-level testing
OTDR: Distance and event analysis
VFL: Short-range visible fault checking

Buyers should explain the intended application rather than simply requesting a “fibre tester.”

Seventh Question: Is Fault Location Required?

The NK281 and optical power meter measure the total loss of the link. They do not display the exact location of each fault.

If the customer needs to locate:

Fibre break
High-loss splice
Reflective connector
Abnormal event
End of cable
Distance to fault

an OTDR is required.

The stable light source and OTDR are complementary instruments:

The light source and power meter confirm overall link performance.
The OTDR identifies where individual events occur.

Eighth Question: Are RJ45 Functions Useful?

The NK281 also supports basic network-cable testing functions, making it suitable for contractors handling mixed fibre and copper cabling.

Depending on the supplied configuration, these functions may include:

RJ45 wire-sequence testing
Open-circuit identification
Short-circuit identification
Network-cable length measurement

This is useful for:

CCTV installers
Structured-cabling contractors
FTTH technicians
Server-room maintenance
Building IT technicians
Factory network teams

However, these basic tests do not replace professional Cat 6 or Cat 6A certification equipment.

NK281 or NK301: Which Should You Choose?

Choose the NOVKER NK281 when:

You work with both fibre and RJ45 cables.
You want a practical multifunction field instrument.
You mainly serve FTTH, CCTV and network customers.
Basic cable-sequence and length testing are useful.
Portability and versatility are priorities.

Consider the NOVKER NK301 when:

Your work is focused mainly on optical fibre.
You require a dedicated professional stable light source.
A specific single-mode/multimode combination is needed.
You require as many as four wavelengths.
Extended operating time is important.

For general Malaysian network contractors, the NK281 is likely to be easier to use and sell. For specialised fibre companies, the final choice depends on the required wavelength configuration.

Common Buying Mistakes

Avoid these common mistakes:

Buying based only on price

A cheaper light source may not provide the required wavelengths or adaptors.

Assuming all models have the same wavelengths

Different versions of the same model may have different optical configurations.

Forgetting the optical power meter

The light source alone does not provide a complete insertion-loss measurement.

Mixing single-mode and multimode requirements

Single-mode and multimode fibre normally require different test wavelengths and test conditions.

Ignoring connector type

The wrong connector or adaptor can prevent proper testing or create additional loss.

Expecting the NK281 to locate a break

An OTDR is required to determine the distance to a fault.

Testing without cleaning

Dirty connectors can create inaccurate results and may damage the mating connector.

Recommended NK281 Configuration for General Work

For many Malaysian FTTH and network contractors, a practical package would include:

NK281 with 1310/1550nm output
Compatible optical power meter
SC/UPC and SC/APC connection accessories as required
Reference patch cords
Fibre connector cleaner
Visual Fault Locator
Protective carrying case

Contractors who regularly handle multimode fibre should also consider 850/1300nm capability.

The final configuration should be based on the customer’s fibre type and project requirements.

Information to Provide When Requesting a Quotation

To receive an accurate quotation, tell MTM Precision:

Fibre type: single-mode or multimode
Required wavelengths
Connector type
UPC or APC connection
Light source only or complete kit
Need for optical power meter
FTTH, data centre, telecom or building application
Whether OTDR fault-location capability is also required

This information helps prevent ordering an unsuitable configuration.

Contact MTM Precision

Contact us for advice and quotations for the NOVKER NK281, NOVKER NK301, optical power meters, VFLs, PON testers and OTDRs in Malaysia.

MTM Precision Sdn Bhd
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.

Website: www.mtmpre.com.my
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com