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Laser diodes and LEDs for fiber optical communication

  • H. Kressel
  • M. Ettenberg
  • J. P. Wittke
  • I. Ladany
Chapter
Part of the Topics in Applied Physics book series (TAP, volume 39)

Keywords

Laser Diode Carrier Lifetime Stripe Width Power Emission Internal Quantum Efficiency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of Symbols

αfc, αout

Free carrier absorption coefficient and absorption coefficient in passive regions, respectively [cm−1]

αj

Diode constant

βs

Constant in gain relation with current density

Γ

Fraction of wave intensity inside the active region

Δn

Refractive index step at heterojunction

ηc

Coupling efficiency of diode into fiber

ηext

Differential external quantum efficiency (laser)

ηi

Internal quantum efficiency ηp

ηp

Power efficiency

θ,θ|

Beam width at half-intensity in the directions perpendicular and parallel to the junction plane

λ, λL

Emission wavelength

τ

Minority carrier lifetime

τr

Radiative lifetime

τnr

Nonradiatlve lifetime

τlaser

Operating time for 20%, laser threshold current increase

τLED

Operating time for a 50% output reduction from an LED

ao

Lattice constant (Δao/αo is the misfit strain)

b

Exponent in gain relation with current density

Br

Recombination coefficient [cm3 s−1]

d

Active region thickness

e

Electron charge

Eg

Bandgap energy [eV]

fc

Diode bandwidth

g

Gain coefficient [cm−1]

Ith

Threshold current [A]

Jth

Threshold current density [A cm−2]

L

Fabry-Perot cavity length

N.A.

Numerical aperture of fiber

Ne

Injected electron-hole pair density [cm−3]

Po

Power emitted

po, no

Equilibrium carrier concentrations in active region (holes, electrons)

R

Facet reflectivity

Rs

Diode series resistance

S

Surface recombination velocity [cm s−1]

To

Parameter describing temperature dependence of the threshold current (2.12) [K]

Va

Applied voltage

W

Stripe width

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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • H. Kressel
  • M. Ettenberg
  • J. P. Wittke
  • I. Ladany

There are no affiliations available

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