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er H A fibre coupled DFB laser with 10 mW output power, centred at 1550 nm wavelength, is fibre-coupled to a fused fibre coupler which works as a 50:50 splitter. The splitter delivers equal power to the two arms of an integrated optics Mach-Zehnder interferometer with electro optic (EO) modulators in each arm. The output of the interferometer is fibre-coupled to a InGaAs pin photodiode detector with: Responsivity R = 0.75 A/W, bandwidth B = 1 GHz, load resistance RL = 50 , dark current la = 5 nA. Assume no joint losses and fibre losses between the laser, splitter, interferometer and detector Pin fused fibre coupler P₁ EO Modulator 1 EO Modulator 2 Pout Detector P₂ igure Q2:1: Schematic of part of optical communications system (a) Consider the fused fibre coupler directly connected to the DFB laser: i) If the coupling length Lc of the fused fibre coupler is 250 μm, calculate the minimum interaction length L for the 50:50 power split at the wavelength of the DFB laser used in the setup. ii) Replacing the DFB laser with a Fabry Perot laser operating at 1310 nm leads to a change in coupling length Lc to 200 μm. Calculate the new power ratio between P₁ and P2 if the interaction length L is kept at 1.3125 mm.

er H A fibre coupled DFB laser with 10 mW output power, centred at 1550 nm wavelength, is fibre-coupled to a fused fibre coupler which works as a 50:50 splitter. The splitter delivers equal power to the two arms of an integrated optics Mach-Zehnder interferometer with electro optic (EO) modulators in each arm. The output of the interferometer is fibre-coupled to a InGaAs pin photodiode detector with: Responsivity R = 0.75 A/W, bandwidth B = 1 GHz, load resistance RL = 50 , dark current la = 5 nA. Assume no joint losses and fibre losses between the laser, splitter, interferometer and detector Pin fused fibre coupler P₁ EO Modulator 1 EO Modulator 2 Pout Detector P₂ igure Q2:1: Schematic of part of optical communications system (a) Consider the fused fibre coupler directly connected to the DFB laser: i) If the coupling length Lc of the fused fibre coupler is 250 μm, calculate the minimum interaction length L for the 50:50 power split at the wavelength of the DFB laser used in the setup. ii) Replacing the DFB laser with a Fabry Perot laser operating at 1310 nm leads to a change in coupling length Lc to 200 μm. Calculate the new power ratio between P₁ and P2 if the interaction length L is kept at 1.3125 mm.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Q2. Laser The optical system shown in Fig. Q2:1 has the following components: A fibre coupled DFB laser with 10 mW output power, centred at 1550 nm wavelength, is fibre-coupled to a fused fibre coupler which works as a 50:50 splitter. The splitter delivers equal power to the two arms of an integrated optics Mach-Zehnder interferometer with electro optic (EO) modulators in each arm. The output of the interferometer is fibre-coupled to a InGaAs pin photodiode detector with: Responsivity R = 0.75 A/W, bandwidth B = 1 GHz, load resistance RL = 50 , dark current la = 5 nA. Assume no joint losses and fibre losses between the laser, splitter, interferometer and detector P in fused fibre coupler (a) P₁ EO Modulator 1 EO Modulator 2 P out Detector P₂ Figure Q2:1: Schematic of part of optical communications system Consider the fused fibre coupler directly connected to the DFB laser: i) If the coupling length Lc of the fused fibre coupler is 250 μm, calculate the minimum interaction length L for the 50:50 power split at the wavelength of the DFB laser used in the setup. ii) Replacing the DFB laser with a Fabry Perot laser operating at 1310 nm leads to a change in coupling length Lc to 200 μm. Calculate the new power ratio between P₁ and P2 if the interaction length L is kept at 1.3125 mm.
Transcribed Image Text:Q2. Laser The optical system shown in Fig. Q2:1 has the following components: A fibre coupled DFB laser with 10 mW output power, centred at 1550 nm wavelength, is fibre-coupled to a fused fibre coupler which works as a 50:50 splitter. The splitter delivers equal power to the two arms of an integrated optics Mach-Zehnder interferometer with electro optic (EO) modulators in each arm. The output of the interferometer is fibre-coupled to a InGaAs pin photodiode detector with: Responsivity R = 0.75 A/W, bandwidth B = 1 GHz, load resistance RL = 50 , dark current la = 5 nA. Assume no joint losses and fibre losses between the laser, splitter, interferometer and detector P in fused fibre coupler (a) P₁ EO Modulator 1 EO Modulator 2 P out Detector P₂ Figure Q2:1: Schematic of part of optical communications system Consider the fused fibre coupler directly connected to the DFB laser: i) If the coupling length Lc of the fused fibre coupler is 250 μm, calculate the minimum interaction length L for the 50:50 power split at the wavelength of the DFB laser used in the setup. ii) Replacing the DFB laser with a Fabry Perot laser operating at 1310 nm leads to a change in coupling length Lc to 200 μm. Calculate the new power ratio between P₁ and P2 if the interaction length L is kept at 1.3125 mm.
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