Using the Attenuator

Setting Up the Attenuation

1. press CAL, and

2. edit the factor using the Modify keys (see “Using the Modify Keys” on page 29).

Resetting the Calibration Factor

To reset the calibration factor, press and hold CAL until the value resets to zero (this takes approximately two seconds). The calibration factor resets to zero.

Transferring to the Calibration Factor

You can transfer the attenuation factor shown on the display into the calibration factor, so that the attenuation factor is reset to zero.

You would use this, for example, after you have set the power through the attenuator at a specific level. When you have reset the attenuation factor, you can edit it to get a relative attenuation.

The filter attenuation stays constant when you transfer to the calibration factor. This means that the new calibration factor is calculated from the attenuation factor and the old calibration factor according to the formula below (from equation (1)):

CalNEW(dB) = -Attfilter(dB) = CalOLD(dB) - AttOLD(dB)

To transfer to the calibration factor, press DISP→ CAL.

 

Entering the Wavelength

 

The attenuation at any point on the filter is wavelength dependent.

 

This dependence is measured and stored in the instrument, and is

 

used, with the value for the wavelength entered by the user, to

 

compensate for the dependence. This is the wavelength calibration

 

data.

 

 

NO T E

There are two ways of using the wavelength calibration data,

 

• to reposition the filter so that the attenuation stays constant, or

 

• to change the attenuation factor on the display to show the

 

wavelength dependence. You use this to set the wavelength for an

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Agilent Technologies 8156A manual Entering the Wavelength
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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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