Optical Link Budget ECE 4006 Gb Ethernet Optoelectronic Links.

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Presentation transcript:

Optical Link Budget ECE 4006 Gb Ethernet Optoelectronic Links

Logical Flow for Optical Link Power Budget Output current from laser driver (mA) Vertical Cavity Surface Emitting Laser Slope Efficiency (mW/mA) Input optical signal to photodetector Responsivity (A/W) Input current to receiver (mA) Optical signal on optical fiber

Sample VCSEL Specs Honeywell HFE VCSEL specifications.- Honeywell HFE VCSEL specifications.-

Sample Photodetector Specs Lasermate RSC M85A306 photodetector specifications.- Hammamatsu S5973 photodetector specifications.

Sample Optical Power Link Budget HFE HFE Ith (mA)66 DC bias of laser (mA)7.2 Slope Efficiency (mW/mA) Modulation Current of TX (mA)30 Range of Power Output (mW) Range of Power Output (w/ Loss) (mW) Responsivity of Lasermate PD (A/W)0.4 Responsivity of Hamamatsu PD (A/W)0.47 Range of Current from Lasermate PD (uA) Range of Current from Hamamatsu PD (uA)

Optical Link Budget Issues Choose only components that will achieve Gb Ethernet compliant data rates. What is the range of output currents from the laser driver? What is the slope efficiency and min/max output from the VCSEL? What are the fiber and connector losses? What is the total input power to the PD? What is the responsivity of the PD? What is the dark current of the PD? What is the max PD input power? What is the min/max PD output current such that the receiver operates? What is the capacitance of the PD? (this needs to be matched to the receiver to achieve Gb Ethernet compliant data rates).

Optical Packaging Issues Alignment tolerance and power dissipation directly affect the cost of the module. Consider these issues when specifying the VCSEL, PD, and fiber. Alignment tolerance: maximize the alignment tolerance (how much the fiber/VCSEL and fiber/PD can be misaligned, yet still get a Gb Ethernet compliant eye) –Evaluate the effect of the VCSEL aperture and divergence angle –Evaluate the effect of the MMF (multimode fiber) core diameter and numerical aperture (NA) –Evaluate the effect of the PD responsivity and aperture Power dissipation: minimize the power dissipation (run the optical link at the lowest power possible, and with the least power dissipation, yet still get a Gb Ethernet compliant eye) –Evaluate the effect of the VCSEL slope efficiency –Evaluate the effect of the PD responsivity Note: the bandwidth/distance product for 50  m diameter core MMF is larger than for 62.5  m diameter core fiber. We will use 62.5  m MMF in this class

Fiber core VCSEL/PD Longitudinal Misalignment Fiber core VCSEL/PD Transverse Misalignment Alignment Tolerant Fiber/OE Component Connection