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The Yamasaki TLU4 1310 1550 1625 nm Optical Light Source supports singlemode fibre loss testing with a compatible optical power meter. It features adjustable output power, Wave ID and selectable modulation tones. Pair it with the TPU1 Optical Power Meter and RapidConnect Reference Cable Kit to complete your testing setup.
The Yamasaki TLU4 1310 1550 1625 nm Optical Light Source provides three wavelengths for singlemode fibre testing. When paired with a compatible optical power meter, it supports insertion-loss measurements across your specified test wavelengths. For pricing and help selecting your testing accessories, request a Rapid Quote.
In particular, the TLU4 suits testing programs that require 1625 nm alongside 1310 nm and 1550 nm. Therefore, it provides a focused choice for technicians who need this specific singlemode wavelength combination.
Fibre performance can vary with wavelength. Consequently, testing at several wavelengths provides a broader assessment than a measurement at one wavelength alone.
These wavelengths form a common combination for singlemode installation testing. However, your project specification should determine the required measurements and acceptance limits.
For consistent results, set the power meter to the source wavelength and establish the appropriate reference before testing. In addition, record each wavelength separately so that you can compare results against the relevant limits.
The longer 1625 nm wavelength can reveal greater loss from fibre bends than measurements at shorter wavelengths. As a result, it can provide useful additional information when assessing wavelength-dependent loss.
However, a light source and power meter measure loss across the test path. They do not identify the distance to an individual bend, splice or connector.
Therefore, use an appropriate OTDR when you need to locate an event along the fibre. Additional 1625 nm testing should complement the measurements required by your project.
The TLU4 combines adjustable optical output with Wave ID and selectable modulation tones. In addition, its ambient light sensor adjusts the LCD brightness to suit surrounding conditions.
These functions support practical field testing. For example, compatible receiving equipment can recognise the transmitted wavelength or detect a selected tone. Nevertheless, confirm receiver compatibility before relying on automatic identification.
| Specification | Details |
|---|---|
| Operating wavelengths | 1310, 1550 and 1625 nm |
| Fibre type | Singlemode |
| Adjustable output power | −12 to −5 dBm |
| Adjustment step | Less than 0.5 dB, as listed |
| Output stability | 0.15 dB over 30 minutes at 20°C |
| Operating modes | CW, 270 Hz, 330 Hz, 1 kHz and 2 kHz |
| Optical port | FC/PC |
| Connector accessories | FC, SC and ST included; LC adaptor available |
| Battery supply | Three 1.5 V AA alkaline batteries |
| Listed battery operating time | 45 hours |
| Operating temperature | −10°C to +60°C |
| Dimensions | 180 × 90 × 45 mm |
| Listed weight | 250 g |
| Warranty | 12 months |
For the published specifications, download the Yamasaki TLU4 datasheet.
The Yamasaki TPU1 Optical Power Meter provides calibrated settings for all three TLU4 wavelengths. Furthermore, it supports Wave ID from compatible TLU sources, allowing automatic wavelength recognition.
The TPU1 also stores measurement results for USB download. Consequently, the receiving meter provides the recording and reporting capability within this testing combination.
Before ordering, confirm the measurement range, connector arrangement and reporting requirements for your application.
Your reference leads form part of the measurement setup. Therefore, choose singlemode leads with connectors and polish types that match the equipment and link under test.
The RapidConnect Reference Cable Kit provides a starting point for discussing your required lead and adaptor configuration.
In addition, agree on the reference method before testing. Your chosen method affects which connections the measurement includes, so apply it consistently throughout the job.
For repeatable measurements:
Start with the wavelengths listed in your testing specification. If your work requires 1310, 1550 and 1625 nm, the TLU4 offers that combination in one handheld source.
Alternatively, if your specification requires only 1310 and 1550 nm, consider the Yamasaki TLU3 Singlemode Optical Light Source. Likewise, projects requiring 1490 nm need a source configuration that includes that wavelength.
Choosing a three-wavelength optical light source involves more than selecting the wavelengths. You also need to understand reference procedures, power meter compatibility and the interpretation of wavelength-dependent loss.
That is why Anderson Corporation is developing a practical Knowledge Centre dedicated to 1310, 1550 and 1625 nm light source testing.
Whether you test new installations or assess existing singlemode links, these resources will support more informed equipment and testing decisions.
Future articles will explain the role of 1625 nm alongside 1310 nm and 1550 nm. In addition, they will explore reference setup, compatible power meters and the interpretation of loss measurements.
Articles coming soon.
For additional fibre testing explanations and product demonstrations, visit the Anderson Corporation YouTube channel.
An optical light source transmits light into the fibre under test. A compatible power meter measures the received power. After establishing a reference, this combination allows you to measure insertion loss.
It adds a longer-wavelength measurement to your testing program. In particular, comparing results can help assess wavelength-dependent loss, including increased sensitivity to bends.
No. A source and power meter measure loss across the test path. Therefore, use an appropriate OTDR when you need to locate individual events.
No. Wavelength coverage alone does not establish suitability for live-network testing. Before connecting, confirm the network’s test procedure and the required isolation, filtering and equipment compatibility.
Your project specification determines the required wavelengths. Accordingly, use 1625 nm where the test plan calls for it, while retaining the required installation measurements.
Build your testing setup around the wavelengths, connectors and reporting requirements of your project. In addition, include suitable reference leads and a compatible optical power meter so that the equipment works together.
Request a Rapid Quote for the Yamasaki TLU4 1310 1550 1625 nm Optical Light Source, TPU1 Optical Power Meter and RapidConnect Reference Cable Kit.
