How to Choose the Correct Fiber Optic Attenuator?

Introduction

Regarding fiber optic attenuators, making the wrong selection can result in system damage and decreased performance. To make the correct choice, there are a few factors you’ll need to consider. This article will help you choose the suitable fiber optic attenuator for your system.

But First, What Are Fiber Optic Attenuators? 

Fiber optic attenuators are devices used to introduce attenuation into an optical fiber link deliberately. Attenuation reduces the power density of an optical signal as it passes through a medium. Fiber optic attenuators are used to either decrease the optical power level of a signal or equalize the power levels between two fibers to prevent overloading of the receiving fiber.

Before we talk about choosing the correct fiber optic attenuator, we need to explain the main terms of fiber optic attenuator.

Fixed Optic Attenuator

A fixed optic attenuator is a device with a pre-set attenuation level that cannot be changed. Fixed attenuators are typically used to permanently reduce the optical power of a signal to a safe level for the receiver.

Variable Optic Attenuator

Unlike fixed optic attenuators, variable fiber optic attenuators allow the user to adjust the amount of attenuation introduced into the link. Variable attenuators are typically used during system testing and troubleshooting to help diagnose and correct optical power problems.

Fixed Optic Attenuator vs. Variable Optic Attenuator, What is the difference?

The main difference between fixed and variable attenuators is that fixed attenuators have a pre-set attenuation level that cannot be changed. In contrast, variable attenuators allow the user to adjust the amount of attenuation introduced into the link.

Generally speaking, the pricing of variable attenuators is higher than fixed attenuators due to their more complex designs and better manageability.

How to Choose the Correct Fiber Optic Attenuator?

When it comes to choosing the right type of fiber optic attenuator for your specific application, several factors need to be considered, including:

• Fiber Optic cable type: The first thing you need to consider is the type of fiber optic cable you use. Fiber optic attenuators are available for both single-mode and multimode fiber, and it is critical to select the suitable type for your application.
• Fiber Optic Connector: Next, you need to consider the type of fiber optic connector you’re using. Fiber optic attenuators are available with various connectors such as LC, SC, ST, FC, and MPO, and it’s essential to make sure you choose the correct type for your application.
• Wavelength: Fiber optic attenuators also have different attenuation levels for various wavelengths, including 850nm, 1310nm, and 1550nm.
• Polish Type: Fiber optic attenuators are available in various polish types, such as UPC, APC, and PC. The most common type is UPC or PC polish, which is recommended for most applications.
• Attenuation Value: different applications request different values. You can choose the Fiber Optic Attenuator with varying attenuation levels according to your need. For example, for the 10G SFP+ ZR transceiver in the short-distance application, you have to choose a higher attenuation value to avoid any damage and overload on the receiver side.

In the paragraph above, we introduced the fiber optic attenuator basic categories and related terms, as well as the how to choose the correct Fiber Optic Attenuator according to Fiber optic cable type, Fiber optic connector type, wavelength, polish type, and Attenuation value.

Bestseller Optcore Fiber Optic Attenuators

FAQs about Fiber Optic Attenuators

Q: What are the principles of operation of the fiber optic attenuator?

A: Fiber Optic Attenuators work by reducing the power of a signal that travels through a fiber optic cable. This is done by adding scattering or gap-loss to the line, which can cause the signal to weaken or even disappear. Fiber Optic attenuators come in different types, each with its way of reducing signal power.

Q: What is the maximum attenuation Optcore provides?

A: The maximum attenuation that Optcore provides is 25dB. However, you may also custom order attenuators with higher attenuation.

Q: Can the variable optic attenuator replace the fixed optic attenuator?

A: Yes, the VOA can replace the fixed attenuator.

Q: Where is the fiber optic attenuator used?

A: Fiber optic attenuators are generally used in two applications: to compensate for differing optical power levels between devices connected in a network or to deliberately reduce the optical power level to prevent signal distortion or damage to sensitive equipment.

Q: What is the return loss of fiber optic attenuator?

A: The return loss is the ratio of the optical power reflected into the input side of an optical device to the optical power launched into the device. It is usually expressed as ‘dB’.

Q: What is the typical attenuation value for a fiber optic attenuator?

A: The typical attenuation values for Fiber Optic Attenuator are 3dB, 5dB, 7dB, 10dB, 15dB, and 20dB.

Q: Do you have an MPO or MTP fiber optic attenuator?

A: Yes, we have an MPO and MTP Fiber Optic Attenuator. But since very few customers use MPO/MTP Fiber Optic Attenuator, we don’t keep them in stock. We can make a particular order for you if you need an MPO or MTP Fiber Optic Attenuator.

Q: How about the lead time for a normal fiber optic attenuator?

A: We have huge stock for regular LC and SC attenuators, so we can ship it out within 1-2 days. But for some other fiber attenuators, the lead time is about 4-6 days. 

Final Words

We hope that at the end of this guide, you will have a better understanding of fiber optic attenuators and how to select the model that is most appropriate for the task at hand. If you have any questions, please do not be reluctant to get in touch with us. We are always happy to help!