ece228 lecture 13 [Compatibility Mode]

ece228 lecture 13 [Compatibility Mode] - Bowers ECE 228A...

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Bowers ECE 228A Laser and Detectors Lecture #13 John Bowers ECE 228A Read Chapter 3 Make up Friday, May 21
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Bowers ECE 228A Bandwidth Limiting Factors Resonance Frequency • Current or power limited Damping • Spectral hole burning or carrier heating limited Transport • Diffusion or tunneling limited Parasitics Capacitance and resistance limited icrowave Effects Microwave Effects • Microwave loss limited
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Bowers ECE 228A Laser Parasitics evice and package parasitics can cause significant Device and package parasitics can cause significant reduction in modulation response Junction capacitance C p Bond pad capacitance C bp eries resistance R R s C bp L Series resistance R s Bond wire inductance L c Example: To achieve 15 GHz bandwidth: 2pF C 2pF C bp 0.3nH L 4 R S p
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Bowers ECE 228A Parasitics arasitic limited 3 dB bandwidth contours Parasitic limited 3 dB bandwidth contours J.E. Bowers, Solid-State Electronics, vol. 30, no. 1, 1 (1987)
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Bowers ECE 228A Laser Impedance Model for laser impedance, consisting of bond-wire inductance, parasitic capacitance and series sistance. resistance. Measurements show microwave characteristics of two mounted laser structures: a constricted mesa laser a high power dual-channel planar buried heterostructure laser (DCPBH) Inductance and resistance are determined from measurement of forward biased laser s shown) Capacitance can be found from (as shown). Capacitance can be found from reverse biased measurement
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ece228 lecture 13 [Compatibility Mode] - Bowers ECE 228A...

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