FAQ
Is low attenuation a sign of good quality plastic optical fiber?
Generally yes, but in lighting plastic optical fiber the manufacturer's attenuation figures are frequently meaningless. (In order to be reasonable this is the only figure they can quote)
Attenuation is measured using a laser, a light emitting diode or a collimated light source. In all three cases the light used is monochromatic, meaning that only one wavelength or a very narrow set of wavelength is used.
The figures issued by manufacturers, per example:150dB/Km refer to that single wavelength and corresponding color which could be yellow or yellow/green.
The same plastic optical fiber may have an attenuation of 750dB/Km on the blue end of the spectrum and 400dB/Km on the red side.
To calculate the average attenuation for white light would involve firstly analyzing the light of the lamp in the illuminator to determine its composition that could vary enormously, even for two identical lamps. Then one would have to measure attenuation in all individual wavelengths taking into account the amount of each present on the lamp's emission. Finally, we would have to compute to obtain a result which would only hold true for that lamp/plastic optical fiber combination.
To be honest a close average can be worked out with a few instruments but lamp deterioration due to aging, dust in the system and coloring of the common end due to solvent migration from the positing compounds, if used, soon make nonsense of averaged figures.
Why do some optical fibers change the color of the light?
In fact, all optical fibers change the color of the light in one way or another. Due to the physical characteristics of the conductor some frequencies travel with less impediment than others and it is impossible to produce a fiber that would have the same attenuation on the whole of the visible spectrum. To expect a light conductor to transport millions of different wavelengths along with exactly the same attenuation in every one would be quite unreasonable.
Some optical fibers absorb a little more blue than red and less green than yellow and others just the possite. Consequently, the hue and tone of the light varies from meter to meter, in some cases very apparently. This phenomenon is referred to as selective spectral absorption.
What are bare fibers?
The term is used mainly with PMMA fibers or MMA fibers and refers to the optics that have no external protection sheath.
The advantage of plastic optical fiber
Plastic optical fiber are soft, light, more resistant to damage (vibration and bending). Plastic optical fiber has excellent
tensile strength, durability and the characteristics of the small footprint. These advantages make the plastic optical
fiber successful application is particularly important in the car. A typical luxury car within at least a few kilometers of
the copper wire and copper wire, weight and cost increase greatly. Planes, trains, and all the other traffic tools, etc.
Due to the large diameter and numerical aperture of plastic optical fiber, light transmission capacity is big. Plastic
optical fiber than copper type of transmission medium (twisted-pair cable and coaxial cable) has a much higher
bandwidth capacity. Transmission frequency is higher, the cost of the use of plastic optical fiber is lower.
Plastic optical fiber cutting, wire, bonding, polishing and other processing are easy. With larger diameter, plastic
optical fiber installed and connected to the device, light source, detector, etc become easy and low cost, non-
professionals can also do these operations. Preparation of plastic optical fiber connection is no more than 1
minute, also do not need special tools. Even the simplest of scissors can also be used to cut plastic optical fiber.
Plastic optical fiber transceiver module use 650 nm wavelength red, very safe, it is easy to judge the user visible
optical fiber connection was successful. In addition, plastic optical fiber connection is not sensitive to face hidden
to keep dust and debris.
Plastic optical fiber does not produce radiation, completely is not subject to electromagnetic interference and radio-
frequency interference and the influence of noise. This is particularly important for video and audio of the shunt,
obviously these interference and noise affect the image and service quality. Plastic optical fiber and copper in the
same pipe or the same wire laying side by side. Plastic optical fiber does not produce noise, not a negative impact
on the current network.
POF system cost is low. Is said to be used for home networking and car including consumer electronics, home audio,
DVD, VCR, etc of each connection costs less than $20. So these parts can be bought in ordinary shops.
Through the plastic optical fiber data transmission is not likely to be tapped, so plastic fiber in some occasions with
higher requirements, safety degree is very applicable.
Although silica optical fiber is widely used in long-distance trunk communications and optical fiber to the home,
but the plastic optical fiber is referred to as "common" optical fiber, the reason is that the plastic optical fiber and
related connection devices and installation of total cost is lower. In the optical fiber to the home, fiber to the desktop
overall scheme, plastic optical fiber is a supplement to the silica fiber, can together build an all optical network.
Compared to POF and silica fiber, has the following advantages: low modulus, large core diameter (0.3 1.0 mm), in the
place can use simple POF connector, even if is the fiber connection center at 30 microns deviation will not affect the
coupling loss; Around large numerical aperture (NA0.5), by light Angle can reach 60 °, and silica fiber is only 16 °,
available cheap LED, and coupling efficiency is high; Good flexural, easy processing and use; In the visible area has low
loss window; Light weight; Low cost and processing cost.
POF network in the local area network (LAN) system compared with other transmission medium, also has the obvious
advantages: POF is not sensitive to electromagnetic interference, radiation does not occur, the data rate under different
attenuation constant, bit error rate can be predicted, can be used in the electrical noise environment; Its size is longer,
can reduce the requirement of tolerance in the design of joint control, so the network cost is low.Plastic optical fiber
Do You Can Send Sample? Sample Is Free Or Paid?
Yes, we can send free samples. But customers should bear the freight. Our products are not all of the models can send free samples; part of the product sample is pay for it. You should contact our salesman at first.
What’s your company payment?
T/T, PayPal, Visa, Western Union, L/C
What are fiber optics made off?
For lighting purposes or visible light spectrum transmission, several kinds of fibers are used. Glass in very fine strands that have to be bunched together in order to make a sizeable light carrier,PMMA, and polycarbonate in sizes from 0.25 to 3mm and solid core fibers made from special polymers in a Teflon sheath from 3mm to over one-inch thick. Other types of fibers such as liquid core,colored fibers,fluorescent,and scintillating are little used and for specialized applications.
How to contact sales person?
You can contact our sales person online, have a telephone, or send a e-mail. The contact information you can check on "Contact Us" in our website.
Do You Provide Technical Support? How To Contact Technical Person?
Yes, we do. You can see the contact information in "Contact Us" in our website.、
How can I get the details of products?
You can download the PDF file in the product introduce of our website. If you need more, please contact our salesman.
Suggestions
The Hwaying Fiber Optic FAQ continues to expand and improve. If you have suggestions for improvement, we would enjoy hearing from you. Please contact us. Thank you!
