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Furukawa Electric: New Raman amplifier/excitation light source: Ultra-hi-speed optical fiber comm, extension
March 10, 2020
Furukawa Electric:
In order to cope with the rapidly increasing communication traffic in recent years, technological innovation of ultra-high-speed optical fiber communication is required.
Furukawa Electric has developed a pumping light source for forward pumping Raman amplifiers to extend the transmission distance.
Ultra-high-speed optical fiber communication: FRSi4XX series
Furukawa Electric has developed the FRSi4XX series for ultra-high-speed optical fiber communications.
FRSi4XX is a forward pumping Raman amplifier / pumping light source that can extend the transmission distance compared to the conventional method.
Development: Background
In the 400Gbps ultra-high-speed optical fiber communication that will be fully introduced in the future, it is important to improve the received signal-to-noise ratio (OSNR).
The existing optical amplifier EDFA cannot secure the required OSNR.
Demand for Raman amplifiers (Note 3) with excellent noise characteristics is expected to increase.
Above all, expectations are growing for forward-pumped Raman amplifiers that can maximize the advantages of Raman amplification as a technology for extending the transmission distance (Note 4).
Conventional method: Raman amplifier / back-pump method
Since the output and noise characteristics of the pump light source for the forward pump Raman amplifier were limited, only the backward pump method was practically used as the Raman amplifier.
Current method: Raman amplifier / forward pumping method
This time, we have developed the FRSi4XX series of forward-pumped Raman amplifier / pump light sources with high output and excellent low-noise characteristics.
Main product specifications:
Model name: FRSi4XX series
Light output (mW)> 100
Noise characteristics: RIN (dB / Hz) <-130 (up to 3GHz)
Drive conditions: EOL (Note 5), Ts = 25 ℃, Tc = 70 ℃
Wavelength (nm): 1420 to 1500
Wavelength spectrum width (nm):> 25
(Note 1) Optical signal to noise ratio (OSNR):
Abbreviation for Optical Signal to Noise Ratio.
Defined as the ratio of signal light power to noise light power, improvement in OSNR contributes to longer transmission distance.
(Note 2) EDFA:
Erbium Doped Fiber Amplifier.
Erbium-doped optical fiber amplifier in the core of an optical fiber, currently used in wavelength division multiplexing (WDM) systems.
The wavelength around 1550nm can be amplified by 980nm or 1480nm excitation light.
(Note 3) Raman amplifier:
When pumping light is incident on an optical fiber, Raman scattering occurs in a wavelength region about 100 nm longer than the pumping light wavelength.
If signal light exists in this scattered light region, it is amplified by stimulated Raman scattering and can be used as an amplifier.
Although the pumping efficiency is lower than that of EDFA, the noise is low because the optical fiber is used as the amplification medium.
Transmitting the pump light in the same direction as the signal light is called forward pumping, and transmitting the pump light in the opposite direction is called backward pumping.
2020 | News Releases | Furukawa Electric
https://www.furukawa.co.jp/release/2020/kenkai_20200310.html