Raman Amplifier Card

The DRA (Distributed Raman Amplifier) Raman Optical Amplifier Card launched by 3C-LINK utilizes the Raman scattering effect in the quartz fiber to provide gain to the optical signal. Adopting 14xxnm wavelength laser as Raman pumping, it provides gain to C-band signal light, which can effectively compensate for the attenuation of optical signal in fiber long-distance transmission to extend the power budget of optical link and significantly improve OSNR, suitable for long-distance optical transmission system.

Raman Amplifier Card

Raman optical amplifier allows signal amplification at any wavelength. The working principle is based on stimulated Raman scattering (SRS). Undoped optical fiber is used. The photon that is inserted excites the electron and it goes into a vibrating state. Then, the stimulated emission occurs when the electron de-excites to the vibrational state of the glass molecules in the optical fibe

As the limitations of EDFA amplifier working band and bandwidth became more and more obvious, Raman amplifier was put forward as an advanced optical amplifier that enhances the signals by stimulated Raman scattering. To meet the future-proof network needs, it can provide gain at any wavelength. At present, two kinds of Raman amplifiers are available on the market. One is lumped Raman amplifier that always uses the DCF (dispersion compensation fiber) or high nonlinear fiber as gain medium. Its gain fiber is relatively short, generally within 10 km. The other one is distributed Raman amplifier. Its gain medium is common fiber, which is much longer, generally dozens of kilometers.

Model	3C-ONC-DRA
Parameter	Minimum	Normal Value	Maximum	Unit	Remark
Working wavelength	1528		1565	nm
Input optical power	-36		-10	dBm
Effective gain	12	14	15	dB	@G.652 optical fiber > 40km, attenuation coefficient 0.20dB/km
Gain flatness			2.2	dB	@Gain=14
Pump wavelength		1423~1465		nm
Total pump output power	700			mw	@Each pump can be set to 500mw, 2 pumps in total
Noise figure			0	dB
Input optical power threshold	-38			dBm	Configurable
Number of slots occupied	Support all 3C-OTNS8600 series chassis, occupies 2 slots

Model	3C-ONC-BDRA
Parameter	Minimum	Normal Value	Maximum	Unit	Remark
Working Wavelength	1528		1565	nm
Input optical power	0		14	dBm
Effective gain		10		dB	@G.652 optical fiber > 40km attenuation coefficient 0.20dB/km
@Input optical power = 14dBm
Gain fatness			2.2	dB	@Gain=14
Pump wavelength		1423~1465		nm
Total pump output power	700			mw	@Each pump can be set to 500mw
					Total 2 pumps
Noise figure			0	dB
Input optical power threshold	0			dBm	Configurable
Number of slots occupied	Support all 3C-OTNS8600 series chassis, occupies 2 slots

The main difference between EDFA and Raman amplifiers is given in the following table.

Features	EDFA	Raman amplifier
Working principle	It uses stimulated radiation of EDF fibers to amplify optical signals. It requires doped optical fiber.	It uses stimulated Raman scattering for the amplification of optical signals. It does not require doped optical fiber.
Pump power	25 dBm	> 30 dBm
Amplification band	1525 nm – 1565 nm and 1570 nm – 1610 nm.	All wavelengths
Noise figure	5 dB	5 dB
Gain	> 40 dB	> 25 dB, gain is smaller than EDFA, for about 5 –15 dB
Cost factor	Low	High

Recommended

Model	Description	Gain dB	Max.Output(dBm)	Min.Input(dBm)	Max.Input(dBm)
3C-ONC-DRA	Roman EDFA, Input is -36dBm to -10dBm，Gain 12-15 dB，	14dB	+4dB	-36dBm	-10dBm
3C-ONC-BDRA	Booster Roman EDFA, Input is 0dBm to 14dBm，Gain 10 dB，	10dB	24dB	0dBm	14dBm

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