Experiment 9 Fiber Amplifier 2 Experiment In the configuration - PowerPoint PPT Presentation

Experiment 9 Fiber Amplifier 2

Experiment

In the configuration below, for each I 1550 (mA), vary I 980 (mA) and measure: 𝑄 1 = P max,1550 (mW) and P 980 (mW) 1550-nm Laser I 1550 (mA) = 23, 20, 18, 15, 12 mA WDM Isolator Power Meter P 980 (mW) = ? EDFA Optical Spectrum Analyzer WDM P max,1550 (mW) = ? 980-nm Laser I 980 (mA) = 0 to 400 mA, in steps of 50 mA

In the configuration below, measure 𝑄 0 = P max,1550 (mW) for each value of I 1550 (mA) 1550-nm Laser I 1550 (mA) = 23, 20, 18, 15, 12 mA WDM Isolator Power Meter Optical Spectrum Analyzer WDM P max,1550 (mW) = ? 980-nm Laser OFF

Analysis 𝑄 1 ≡ 𝑞𝑝𝑥𝑓𝑠 𝑛𝑓𝑏𝑡𝑣𝑠𝑓𝑒 𝑏𝑠𝑝𝑣𝑜𝑒 1550 𝑥𝑗𝑢ℎ 𝐹𝐸𝐺𝐵 𝑄 0 ≡ 𝑞𝑝𝑥𝑓𝑠 𝑛𝑓𝑏𝑡𝑣𝑠𝑓𝑒 𝑏𝑠𝑝𝑣𝑜𝑒 1550 𝑥𝑗𝑢ℎ𝑝𝑣𝑢 𝐹𝐸𝐺𝐵 𝑄 1 𝐻 ≡ 10 log 10 Gain: 𝑄 0

• For the pump laser, based on measurements from the previous lab, relate the electrical current applied to the laser and the optical power arriving at the EDFA. Remember to consider the insertion loss imposed by the WDM device, which you also have measured. • For each signal power at 1550 nm, plot the EDFA gain (around 1550 nm) versus the pump optical power arriving in the EDFA. • For a particular signal power at 1550 nm (e.g., I 1550 = 12 mA), plot the EDFA absorbance (at 980 nm) versus the pump optical power arriving in the EDFA.

Questions • How does the pump power affect the gain? Is it linear? Do you observe indication of saturation? • How does the signal power affects the gain? Is the gain the same for each signal power? If not, where do you observe higher gain. • Is the optical absorbance of the EDFA at 980 nm constant or does it depend on pump power? • In case you haven’t covered yet this point in the introduction section of your lab report, please explain how an erbium-doped fiber amplifier works.