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Frequently Asked Questions

  

 1. What is the passive optical device?

Optical passive device is a kind of optical device that does not require a source of energy for its operation. Its work principle follows the optic geometry theory and optic physics theory. All the technical data, calculation formula and test methods are associated with the fiber optics and integrated optics.

 

2. How to classify the Optical Passive Devices?

Passive optical devices can be classified by the technical process and the functionality. According to the manufacturing technical process, they can be classified as fiber passive optical devices and integrated passive optical device. Based on their functionality, they also can be classified as optical connector, amplifier, attenuator, power splitter, WDM devices, isolator, switch and so on.

 

3. What are the technical data to evaluate the passive optical devices?

 The evaluation technical data includes insertion loss, reflective loss, operation bandwidth, ripple, wavelength passband, channel passband, channel spacing, extinction ratio, switch rate and so on. The technical data are varied for different devices. But most passive optical devices require low insertion loss, high reflective loss, and wide bandwidth.

 

4. How to evaluate the reliability of a passive optical device?

The reliability is evaluated by how the device performance changed in various environments such as in high/low temperature, high/low temperature cycle, shock, vibration, high-temperature aging test, humidity, and salty fog test. According to the requirement of related standards, the less change the optical technical data has, the higher reliability the device has.

 

5. What is EDFA Gain Module/Block Series for DWDM? How is its application?

DWDM technology is the most effective way to expand the optical communication capability today. EDFA Gain Module/Block series for DWDM are the key components in the DWDM transmission system. It can effectively solve the insertion loss that caused by the mux/demux and make the relay to be easy in the DWDM system. Due to its 40nm operation bandwidth, EDFA can amplify different optical signals

with multiply wavelengths at the same time. It can be conveniently used in DWDM system to

compensate various optical power losses.

 

6. What is the difference among the single mode connector, multi-mode connector and optical data connector?

l The optical fiber/cable of the Single mode optical fiber/cable connectors is single mode with core diameter of 9um. They are used in the single mode optical fiber/cable systems.

l The optical fiber/cable of the multi-mode optical fiber/cable connectors is multiple mode with core diameter of 50um. They are used in the multi-mode optical fiber/cable systems.

l The optical fiber/cable of the data optical fiber/cable connectors is data fiber with core diameter of 62.5um. They are used in the data optical fiber/cable systems.

 

7. What is optical attenuator? What types it has?

Optical attenuator is the component used to reduce the optical power level of an optical signal. The basic types of optical attenuators are continuously variable, step-wise variable and fixed.

 

8. What is the optical coupler? What are the technologies to make the optical couplers?

The optical coupler is a component to combine the optical signals in a particular couple area and then split them again. The most often used technologies are optic components combination, Fused Biconic Tapered (FBT), and Planar Lightwave Circuit (PLC).

 

 

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