NOTE

Figure 4-1

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Using your Attenuator as a Variable Back Reflector

Configuring the Hardware

4.1 Configuring the Hardware

To use the attenuator as a back reflector, you need to set up the hardware as shown in the figure below.

If this your first time to use the attenuator as a back reflector, you first need to make some measurements. These require other setups before setting up the hardware as shown below (see “Setting Up the Software” on page 60).

The Hardware Configuration for the Back Reflector

Before using the instrument, you should make sure that it is properly warmed up. The instrument is properly warmed up when it has been switched on for a minimum of 45 minutes. Failure to do this can cause errors of up to 0.04dB in the attenuation.

If you are not using option 201, the connector interfaces you need depends on the connector type you are using. Option 121 or option 221 (the monitor output) is of no use when using the attenuator as a back reflector. The disruption to the back reflection performance by leaving this output open is negligible, though you may want to terminate it to eliminate any small effect it might have.

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Agilent Technologies 8156A manual Using your Attenuator as a Variable Back Reflector
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8156A specifications

Agilent Technologies 8156A is a high-performance optical source offering advanced capabilities for testing and characterizing optical systems. Specifically designed for applications in telecommunications and data communications, the 8156A stands out due to its precision, versatility, and reliability, making it an essential tool for engineers and researchers in the telecommunications industry.

One of the main features of the 8156A is its ability to generate a stable, accurate, and tunable optical signal. This optical source operates across a wide wavelength range, typically from 1260 nm to 1675 nm, covering key regions used in fiber optics. The tunable laser module is particularly beneficial for applications requiring the testing of fiber optic components, systems, and networks, enabling users to specify any wavelength within this range.

The device employs advanced technologies, including distributed feedback (DFB) laser technology, offering low noise and high output power while ensuring minimal phase and frequency jitter. This results in precise measurements that are crucial for evaluating the performance of optical devices. The 8156A also features a built-in optical power meter, allowing for seamless integration and real-time monitoring of optical power levels during testing.

Another significant characteristic of the 8156A is its user-friendly interface, which includes easy-to-read displays and intuitive controls. This design simplifies operation, allowing users to set up tests quickly and efficiently. Additionally, it provides various output options, including single-mode and multi-mode fiber interface compatibility, expanding its usability across different applications.

The 8156A is equipped to handle numerous protocols and systems, including passive optical networks (PON), optical transport networks (OTN), and traditional wavelength-division multiplexing (WDM) technologies. Its agility in adapting to various protocols enhances its role in research and development settings.

Moreover, the device offers a range of automation features, enabling users to script complex measurement sequences, making it an adaptable solution for both laboratory and field environments. Combined with its robust build quality, the Agilent Technologies 8156A optical source not only ensures reliable operation but also provides a long service life, making it a valuable investment for any optical testing application.
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