The influence of directly modulated DFB LD sub-mode oscillation on long-span transmission system

Henmi, N.; Koizumi, Yoshiko; Shikada, M.; Mito, I.

doi:10.1109/50.4048

Cited by 22 publications

(6 citation statements)

References 4 publications

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“…While not illustrated, the same statement applies for Gd = 4 cm-I. The improvement arising from an increase in the bias current has been observed experimentally [4], [6], [8], [9].…”

Section: Resultssupporting

confidence: 59%

“…The required value of Gd increases with a decrease in the bias current and/or an increase in the bit rate as well as when the encoding format is changed from NRZ to RZ. These results are particularly useful since conventional DFB lasers have threshold gain differences of 6-7 cm on average [8]. For values of Gd larger than this, a phase-shifted DFB laser is required.…”

Section: Resultsmentioning

confidence: 99%

“…The mode loss consists of an internal loss due to scattering and absorption, and an effective wavelength-dependent facet loss which models the mode selectivity of DFB and DBR lasers. The threshold gain difference can be estimated from the lasing mode contribution, side mode contribution, and base level of the optical spectrum when the laser is biased below the threshold current [8].…”

Section: (3)mentioning

confidence: 99%

“…The threshold gain difference between the lasing mode and the dominant side mode has been suggested as a more appropriate parameter [7], [8].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Cartledge¹,

Elrefaie²

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond

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The bit error ratio for lightwave systems affected by mode partition fluctuations is related to laser parameters, laser bias current, transmission bit rate, and encoding format (NRZ, RZ). A simulation-based solution of stochastic rate equations goveming the laser dynamics is used to determine a probabilistic description of mode partitioning. This description is applicable to formula-based methods of evaluating the bit error ratio. Utilizing a truncated pulse wain, 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 2.4Gbit/s NRZ modulation, the threshold gain difference requitement increases from 3 cm-' to 7 cm-' as the bias current of the laser decreases from 1.1 to 0.9 times the threshold current.

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“…While not illustrated, the same statement applies for Gd = 4 cm-I. The improvement arising from an increase in the bias current has been observed experimentally [4], [6], [8], [9].…”

Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: (3)mentioning

confidence: 99%

“…The threshold gain difference between the lasing mode and the dominant side mode has been suggested as a more appropriate parameter [7], [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Cartledge¹,

Elrefaie²

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond

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show abstract

“…5(e). However, the side-mode suppression ratio is still over 40 dB, though the probability of mode hopping has been increased, giving the possibility of a noise floor in the bit-error rate characteristics of a fiber-transmission system [29]. This problem is reduced somewhat with MQW lasers because of the lower linewidth-enhancement factor Dol.…”

Section: B Cw Spectral Characteristicsmentioning

confidence: 99%

Performance comparison of gain-coupled and index-coupled DFB semiconductor lasers

Lowery

Novak

1994

IEEE J. Quantum Electron.

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Comprehensive numerical simulations with the transmission-line laser model (TLLM) are used to compare the behavior of gain-coupled DFB lasers with index-coupled DFB lasers fabricated from identical materials. These simulations compare slope efficiency, threshold current, spectra, smallsignal modulation bandwidth, maximum-intrinsic modulation bandwidth, large-signal transient response and chirp, relativeintensity-noise (RIN) spectra, and feedback sensitivity for coherence collapse. In most cases gain-coupled lasers with additional index coupling have better performance than index-coupled lasers for a given material. However, high-coupling factor index-coupled lasers do have lower threshold currents, lower RIN levels, and lower sensitivity to external feedback than gain-coupled lasers, although spatial hole burning in these devices can be disadvantageous.

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1.3 ?m planar buried heterostructure distributed feedback lasers grown by four-step MOVPE

et al. 1995

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The influence of directly modulated DFB LD sub-mode oscillation on long-span transmission system

Cited by 22 publications

References 4 publications

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

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

Performance comparison of gain-coupled and index-coupled DFB semiconductor lasers

1.3 ?m planar buried heterostructure distributed feedback lasers grown by four-step MOVPE

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