Month: August 2019

How to Buy Optical Fused Coupler: All You Need To Do

Optical coupler is something most important for phonics devices and systems that are meant to combine or split light signals into fibers. The couplers can be either active or passive devices. The passive redistributes the signal without optical-to-electrical conversion while Active couplers split or combine the signals electronically.

When it comes to buying Optical Fused Coupler, there are some crucial factors that you should base your decision.

What you need them for

Before you start searching for Optical Fused Coupler suppliers, get to know where you are going to use them. As each coupler has different features which make them perfect for some certain application, if you know your need, you can choose the coupler equipped with the features essential to cater to your needs.

How they work

A basic fiber optic coupler has two points: N input ports and M output ports. These points will typically range from 1 to 64. But generally, these devices have four-port. How they work depends on the distributed coupling between two individual waveguides in close proximity, and this makes the power gradually transfers between modes which are supported by these waveguides.

 Four ports fiber optic coupler works like this. When light enters into the port 1, it splits into output ports which are port 3 and port 4.  And the port 2 functions in the same way. Sometimes, either port 1 or port 2 remains unused. In such case, the fiber optic coupler acts as a Y or T coupler.

As we have learnt that fiber optic coupler is used to couple or split light, so the coupler is also called fiber optic splitter. The term is used as it, the coupler, splits the light signal.

Where to buy

As you, now, know what you need a coupler for and how a coupler works, you are able to decide on the optic fused coupler. But where you buy it?

There are many fused optical manufacturers and suppliers in China. They make a wide range of couplers for various applications. But choose a manufacture that best suits you.

Check for their clients. This will help you know how they will cater to your needs. If they serve needs of businesses like yours, they are more likely to meet your expectation. Also, make sure if they provide customization. Because. There are many like DK Phontonics that also offer to customize the coupler to meet particular requirements. But make sure the prices offered are reasonable for the quality you get.

Top Reasons to Choose DWDM Mux/Demux

With the internet, there has been a large influx of data, and while this is good for a business as data helps in many ways, it is a challenge to handle big data. Highly efficient and capable data transmission speed seems inevitable.

To solve the paradox of increasing bandwidth with less spending, DWDM Mux/Demux is the perfect choice. This is designed to be capable of transporting even extremely large capacity of data traffic in telecom networks. And all that with high level of efficiency and a greater speed!

A great solution to the bandwidth explosion from the access network!

What is WDM and how does it work?

WDM which stands for wavelength division multiplexing is the process whereby various light waves are multiplexed into one single signal that can be transmitted through an optical fiber.

But the light signals indexed into single signal split into different light waves at the receiver end. There are versions: coarse wavelength division nultiplexing (CWDM) and dense wavelength division multiplexing (DWDM).

And the ‘wavelength steps between the channels’ is the main deference between these WDMs.  For example, while it is 20nm (course for CWDM, for DWDM this is typically 0.8nm (dense).

But here we will discuss the latter, DWDM technology: how it works, its benefits and also the drawbacks if there are any.

DWDM technology works to integrate multiple signals at different wavelengths over the same fiber. This technology is the result of long efforts to find a better solution to the growing need for efficient and capable data transmission. It is uses different colors (wavelength) which are integrated into a device called Mux/Demux which stands for multiplexer/demultiplexer. These devices are meant to integrate and segregate the signals respectively. Mux is used at the feeding end while the Demux on the receiving end.

As the function of Mux is to select one of several input signals to send to the output, it is also called a data selector. It acts as a multiple-input and single-output switch which sends optical signals at high speed over a single fiber optic cable. It eliminates the need for using several devices for different input signals. With Mux, sending a large amount of data over the network at a higher speed is now feasible.

On the contrary, Demux that has one input and more than one out-puts can send one single input signal to one of many devices. Its main purchase is to receive a signal comprising multiple optical frequencies and separates it into its frequency components.

DWDM Mux/Demux modules provide the advantages of DWDM technology in a fully passive solution. They are perfect for long form transmission. In fact, they have a long list of benefits provided you choose the right one for you.  To make the most, you should buy your DWDM Mux/Demux from a reputed supplier like DK Photonics which is known for providing a wide range of high quality optical passive components in China.

7 Crucial Factors of Choosing a Polarizer

Polarization is a crucial aspect of light, and there polarizers – key optical elements used to control polarization. They work to transmit a desired polarization state while reflecting, absorbing or deviating the rest.  There are various polarizer designs, with each having their own advantages and disadvantages. Here we will look at some of the key factors that you should look in order to choose the perfect polarizer for you.

Factors to keep in mind when selecting a polarizer:

Extinction Ratio and Degree of Polarization: The polarizing properties of the best in-line linear polarizer to buy depend upon the degree of polarization or polarization efficiency and its extinction ratio.

So it is crucial to measure the extinction ratio typically which may  vary with wavelength, incident angle along with other factors like cost, size, and polarized transmission for a given application.

Transmission: This refers to the transmission of light in-line polarized the polarization axis direction. This also may refer to the transmission of un-polarized light through the polarizer. For ideal transmission of such polarization is 100%, parallel transmission should be 50% and crossed transmission 0%.

Acceptance angle: This is the largest deviation from design incidence angle at which the polarizer can still perform well as required. Most polarizers can work at an incidence angle of 0° or 45°.

The acceptance angle is important for alignment, and this is more so when it comes to non-collimated beams. Keep this in mind and choose your in-line polarizer which meets your requirements.

Construction: There is a wide range of forms and designs available. For example, thin film polarizers are thin films similar to optical filters. There are thin flat polarizing plate beam splitters placed at an angle to the beam. And polarizing cube beam splitters have two right angle prisms which are mounted together at the hypotenuse. Get the details of polarizer structure to be sure you choose the right one for you.

Clear aperture: This feature often comes with birefringent polarizers. There are optically pure crystals that limit the size of these polarizers. Choose the size of clear aperture according to your needs. Dichroic polarizers come with largest clear aperture.

Optical path length: The length light which is crucial for dispersion, damage thresholds, and space constraints should travel through the polarizer. There is ideal optical path length in birefringent polarizers but likes of dichroic polarizers lack this.

Cost: This is most important factor to look at when it comes to in-line polarizers. The polarizers which come with large, very pure crystals are expensive while the ones made of stretched plastic are a bit more cost effective.

In addition, there are many other factors that may affect the cost, such as place you buy your polarizer from. If you are looking for quality in-line polarizers with features like low insertion loss, high power handling, high extension ratio at a competitive price in China, DKPhotonics is the right choice for you. It is a leading name providing a wider range of quality optical passive components to suit different needs.