Schlagwort-Archive: WDM Optical Network

The Advantages of CATV EDFA

Optical amplifiers serve as an integrated part of long haul data transmission. Fiber optical transponders and fiber optical amplifier are used in the WDM fiber optic system, and it makes WDM transmission possible. In recent years,fiber optic CATV EDFA System especially 1500nm optical fiber CATV System is being rapidly develop in our country.

What is EDFA?

Erbium Doped Fiber Amplifier is short for EDFA,which was applied in 90 s in the optical fiber transmission system and its popularization and application of optical fiber communication technology has brought a revolution.EDFA is in small volume,low power consumption,easy to us.What’s more,it is convenient to install all kinds of application systems,such as SDH frame inside,CATV machine box, DWDM system one of a functional modes of the Optical fiber amplifier system,there are generally two kinds of methods to insert the network management system.One is 232 c interface circuit with optical fiber amplifier to transfer parameters of the optical fiber amplifier and alarm information to the network management system,unified management,display and disposal.

An EDFA is an optical amplifier based on Erbium-doped optical fiber, that amplifies optical signals without converting them into electrical form. EDFAs use semiconductor lasers to pump Erbium Doped Fiber to amplify light in 1.5 μm wavelength region where telecom fibers have their loss minimum. It has low noise and can amplify many wavelengths simultaneously, which makes DWDM possible and becomes a key enabling technology for optical communication networks. Since the realization of EDFA, it has developed rapidly and has become the amplifier choice for most applications in optical communication.



Advantages of CATV EDFA

EDFA is in the low noise,has the characteristics of good gain trace,large amplifier bandwidth,compatible with wavelength division multiplexing (WDM) systems,with high efficiency,work performance is stable,mature technology and so on and so forth.It is very popular in the modern long-distance high-speed optical communication system.

◆ Good character:

Before the pump generally use 980 nm,after level pump use 1480 nm.Minimizing the NF of EDFA by reasonable optimization to make the system access excellent CNR.

◆ Reliability:

Use 1 u 19 “standard rack, built-in high-performance switching power supply.It can work in 85∽265 vac enterprise voltage.DC48V power supply (reservations) can be an option,too.Chassis cooling can be automatic temperature control.

◆ Intuition:

This machine contains a microprocessor to monitor the working state of the pump laser, LCD displays the working parameters.

◆ Network management model:

Options type monitoring transponder to ensure to meet the national standard with the SCTE HMS standards, which can realize network management monitoring.

◆ Adjustable output optical power:

Output optical power can be changed to -3dB.

◆ The power plug type:

Aluminum structure plug type switching power supply.Be good for heat dissipation and replacement.



The most prominent feature of optical amplifier is that the device can amplify optical signal directly without the need to convert the signal into an electrical one before amplifying. EDFA (Erbium-doped Fiber Amplifier) is the one type of many different optical amplifiers that can achieve signal amplification over long-hual optical communication. Fiber-MART provides broad optical amplification solutions for different applications, from telecom, datacom to CATV and has strong technology and experience to design and manufacture EDFA, EYDFA, Raman and Raman-EDFA hybrid. You can save cost by using the most efficient Fiber-Mart CWDM & DWDM Networks solutions. Pls feel free to contact me at


Fiber collimator is an effective passive optical component used for laser beam collimating. and Fiber optic collimators come in many forms.

There are more things to consider  when it comes to purchasing collimators .



Introduction to Fiber Collimator

Fiber Optic Collimators are devices used to expand and collimate the output light at the fiber end, or to couple light beams between two fibers. They are a module that combine a fiber and a lens, and has a function that produces parallel beams. We offer a range of fixed and adjustable fiber optic collimation packages for collimating a laser beam from the end of an FC/APC, FC/PC, or SMA connectorized fiber while maintaining diffraction-limited performance at the design wavelength.  They are available with different wavelengths (850 nm, 980 nm, 1060 nm, 1310 nm, 1550 nm) or fiber options (SM fiber, MM fiber, PM fiber, and LMA fiber, etc).

A fiber collimator is a device that narrows a beam of particles or waves. It can either cause the directions of light to become more aligned in a specific direction, or cause the spatial cross section of the beam to become smaller. Usually, fiber collimator is required to naturally transform diverging lights from an optical fiber to a parallel beam of light. It consists a single-mode or multimode fiber pigtail and a collimating lens. Collimator can also be used to calibrate other optical devices to check if all elements are aligned on the optical axis.



  • Low Insertion Loss and Return Loss
  • Low Back Reflection
  • High Extinction Ratio
  • Low Insertion Loss
  • Wide Operating Wavelength and Temperature
  • Scientific design with serious processing art


  • Optical cable jumper or pigtail cable
  • Laser Beam Collimating
  • Optical cable jumper or pigtail cable
  • PM Isolator and PW WDM
  • Laser Beam Collimating


How Does It Work?

When placing the fiber end on the collimator lens, the light will be aligned to a parallel direction. Then through a slight adjustment of fiber end position, the working distance is obtained. The working distance of fiber collimator is related to the distance between fiber end and lens. According to the actual demands, we can determine the parameters of fiber collimator, such as distance between fiber end and lens, beam radius, accuracy, to achieve better performance.




Selecting the right type of fiber collimator is essential to the performance of network, you should consider your project requirements as important factors. Fiber-MART offer a range of fixed and adjustable fiber optic collimation packages for collimating a laser beam from the end of an FC/APC, FC/PC, or SMA connectorized fiber while maintaining diffraction-limited performance at the design wavelength. For more information, welcome to visit or contact me by E-mail: