Threshold gain difference requirements for nearly single-longitudinal-mode lasers

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Lightwave Technology; (USA)

DOI:https://doi.org/10.1109/50.54478· OSTI ID:6610992

Cartledge, J C; Elrefaie, A F ^[1]

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1. Bellcore, Red Bank, NJ (US)

The probability of error for lightwave systems affected by mode partition fluctuations is related to laser parameters, laser bias and modulation currents, transmission bit rate, and encoding format (NRZ, RZ). A simulation-based solution of stochastic rate equations governing the laser dynamics is used to determine a probabilistic description of mode partitioning. This description is applicable to formula-based methods of evaluating the probability of error. Utilizing a truncated-pulse-train Gauss-quadrature-rule method, many features unique to the problem of assessing the performance implications of mode partitioning are accommodated. Extensive numerical results quantify, for several systems, the required threshold gain difference between the lasing mode and the dominant side mode. For example, for 2.4-Gb/s NRZ modulation, the threshold gain difference requirement increases from 3 cm{sup {minus} 1} to 7 cm{sup {minus}1} as the bias current of the laser decreases from 1.1 to 0.9 times the threshold current.

• OSTI ID: 6610992
• Journal Information: Journal of Lightwave Technology; (USA), Journal Name: Journal of Lightwave Technology; (USA) Vol. 8:5; ISSN JLTED; ISSN 0733-8724
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
AMPLIFICATION
CONTROL
CURRENTS
DYNAMICS
ELECTRIC CURRENTS
EQUATIONS
GAIN
LASERS
MECHANICS
MODE CONTROL
PARAMETRIC ANALYSIS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SOLID STATE LASERS
THRESHOLD CURRENT