Question

12) Compare the spectral bandwidths of IF-97 LED and OPV314AT VCSEL, using their specifications: a) Why spectral bandwidth of the VCSEL is much smaller than that of the LED? b) Is this good or bad? c) Explain Specifications of plastic super-bright red IF-E97 LED CHARACTERISTICS (TA-25°C) ParameterSymbol | Min. | Typ. |Max. |Unit Peak Wavelength Spectral Bandwidth (50% of IMAN | 37 Output Power Coupled into Plastic Riber 1 mm core diameter. Distance Lens to Fiber min250 325 425W s0.1 mm. Impolisted ber, 1F-20 mA | |-6.0|-4.9一|-3-7- SwitchingTime:10% to 90% and 90% to 10%)ト20 Capacitance (F-1 MHz) Forward Voltage (I-20 mA) PEAK 650 00 670 nm 40 nm 1 1 ) 30 pF 4.0 3.0 20 -Forward Cament-mA FIGURE 1. Normalized power launched FIGURE 2. Typical spectral output versus forward current. versus wavelength. I Vertical Cavity Surface Emitting Laser in STTrelectronics Optical Sub-Assembly OPV314AT, OPV314BT, OPV314YAT, OPV314YBT OPTEK Technology Electrical/Optical Characteristics (at 25 ℃ unless otherwise specified) SYMBOL PARAMETER MINİTYPİ MAXI UNITS | TEST CONDITION P1s0 Total Coupled Power P31HAT,OPAYAT 600 50,125 ㎛ Fiber 08 30 A Note Threshold Current 3.0 mA Note1 η Slope Efficiency 90 120 20% to 80% 80% to 20% ps ps 860 nm 0.85 nm Rise Time Fall Time 840 Δλ Optical Bandwidth Vertical Cavity Surface Emitting Laser in ST Optical Sub-Assembly OPV314AT, OPV314BT, OPV314YAT, OPV314YBT Tr electronics OPTEK Technology Normalized Output Power vs. Forward 2 0 Forward Curnent (ma)

Answer 1

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