Page 201 - Optical Communications Essentials

Optical Amplifiers

Optical Amplifiers 191

Figure 11.14. Setup for a typical distributed Raman amplification
system.

TABLE 11.4. Performance Parameters of a 14XX-nm Pump-Pump
Combiner Based on Fused-Fiber Coupler Technology
Parameter Performance value
Device technology Fused-fiber coupler
Wavelength range 1420–1500nm
Channel spacing Customized: 10–40nm
Standard: 10, 15, 20nm
Insertion loss 0.8dB
Polarization-dependent loss 0.2dB
Directivity 55dB
Optical power capability 3000mW

TABLE 11.5. Performance Parameters of Broadband WDM Couplers for
Combining 14XX-nm Pumps and C-Band or L-Band Signals
Parameter Performance value
Device technology Microoptics Thin-film filter
Pump channel λ range 1420–1490nm 1440–1490nm
Pass channel λ range 1505–1630nm 1528–1610nm
Pump channel insertion loss 0.30dB 0.6dB
Pass channel insertion loss 0.45dB 0.8dB
Polarization-dependent loss 0.05dB 0.10dB
Polarization mode dispersion 0.05ps 0.05ps
Optical power capability 2000mW 500mW

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