QUICKSTART GUIDE

8 Optical Power Budget

Inevitably the question that arises is “What is the maximum practical communication distance when using a fiber optic cable?”. The answer isn’t straightforward, but must be calculated as follows:

•First the "Optical Power Budget" is determined by subtracting the receiver’s rated sensitivity from the transmitter’s rated power, both of which are defined in decibels of light intensity. For example if a particular transmitter is rated at minus15 db and the receiver’s sensitivity is rated at minus 31 db, the difference of 16 db is the "Optical Power Budget."

Xmt Output Pwr - Rcv Sens = OPB: Optical power budget

Magnum: ( -15.0 dB ) - (- 31.0dB)= -16 dB OPB

The Optical Power Budget can be thought of as the maximum permitted attenuation of the light signal as it travels from the transmitter to the receiver, while still permitting reliable communication.

•The next step is to calculate the worst case Optical Power Budget by subtracting from the Optical Power Budget, 1 dB for LED aging and 1 dB for each pair of connectors (referred to as "insertion loss").

Worst Case OPB = OPB - 1dB (for LED aging) – 1dB (insertion loss for each pair of connectors) x number of pairs

The final step is to divide the calculated result by the rated cable loss per kilometer to determine the maximum distance.

For costly installations it is recommended that you always measure the actual cable loss before and immediately after the installation to verify that the cable was installed correctly. To avoid damaging the receiver, ensure that the maximum optical input power of the receiver isn’t exceeded.

•Worst case distance = {Worst case OPB, in dB} / [Cable Loss, in dB/Km] where the “typical cable loss” for:

•62.5/125 and 50/125ìm (M.m) is 2.8 dB/km

•100/140 (Multi-mode, 850nm) is 3.3 dB/km,

•9/125 (Single-mode, 1310nm) is 0.5 dB/km (a worst case industry number)

•9/125 (Single-mode, 1310nm) is 0.4 dB/km ( LXSC25)

•9/125 (Single-mode 1550nm) is 0.25 dB/km (ZXSC40, SSCX)

•9/125 (Single-mode 1550nm) is 0.2 dB/km (ZXSC70) and

•9/125 (Single-mode 1550nm) is 0.22 dB/km (ZXSC120)

These are typical cable losses. There will be deviations depending on the manufacturer.

Always measure the loss before installation.

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GE 1601-9026-A3 quick start Optical Power Budget
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1601-9026-A3 specifications

The GE 1601-9026-A3 is a sophisticated and versatile unit that has garnered attention in various industrial applications due to its reliability and advanced features. This product, part of the GEs extensive range of control systems, is designed to meet the needs of modern industries, promoting efficiency and performance.

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A significant characteristic of the GE 1601-9026-A3 is its advanced communication protocols. It supports various industrial communication standards, including Ethernet, Modbus, and TCP/IP, making it highly compatible with existing infrastructure. This interoperability allows for seamless integration into diverse systems, facilitating data exchange and real-time monitoring.

The device also features an intuitive user interface, allowing operators to navigate easily through its functionalities. The graphical display often includes real-time data visualization tools, enhancing operators' ability to monitor system performance and respond promptly to any anomalies. This user-centric design contributes to reduced training time and improved operational efficiency.

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In summary, the GE 1601-9026-A3 exemplifies cutting-edge technology fused with practicality, offering a range of features designed to enhance operational efficiency, reliability, and ease of use. Its advanced communication capabilities, durability, and focus on energy efficiency make it a prime choice for industries looking to modernize their control systems.
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