Gain Flattening Filter
The gain flattening filter (GFF), or gain equalizer (GEQ), is used to compensate for the uneven gain amplification at different DWDM channel by Er-doped fiber amplifier (EDFA). Broptics develops two fiber grating technologies to achieve best price/performance value for customers.



Chirped Fiber Bragg Gratings (CFBG)
Chirped gratings is a sequence of grating periodic change along the transmission axis. By modifying the intensity of grating depth, a matched gain compensation profile can be created. CFBG is able to match the desired profile with minimum errors. Also, Broptics patent-pending athermal package can be applied to resist temperature drift. CFBG is the right choice for high performance EDFA design.

Long Period Gratings (LPG)
Long period gratings differentiate from normal FBG by much wider grating period. The matched wavelength is coupled to cladding mode and absorbed or attenuated. By designing a series of different long gratings, a matched gain compensation profile can be created. Due to its wider period, LPG can be easier made to cover wider bandwidth. By properly select specialty fiber, LPG can be used when cost is the major concern.

About Raysung Photonics Inc:

Raysung photonics located in the export processing zone of Xi'an, China, is specialized in manufacturing FBG, lensed fiber and FBG filter for FTTH. Besides those three main products, Raysung can also manufacture wavelength stabilizer, DWDM FBG filter, chirped fiber grating, long period grating, custom fiber grating and so on. In addition, Raysung has ability to develop and produce special gratings for sensor. The company is committed to the research, design and producing of those products and it is the only one manufacture which has the capacity to volume- producing all sorts of fiber grating in China. Moreover, Raysung is one of the only manufactures in the world who has the capacity to manufacture the type of optical fiber which incorporates FBG and lensed fiber. Raysung's products are widely used in aerospace, construction industry, coal industry etc. The company's professional teams have rich experience in photoelectric area and we have advanced technology and equipment. This allows us to provide our customers with high-quality products and optimized proposals.

In 2006, Raysung completed ISO9001: 2000 and ISO14001 certification and also obtained several patent rights. The materials of our products accord with RoHS criterion. Raysung's products are always superior in quality and competitive in price.