Short-cavity InGaAsP injection lasers: Dependence of mode spectra and single-longitudinal-mode power on cavity length

Lee, Tien-Pei; Burrus, C.A.; Copeland, J.A.; Dentai, A.G.; Marcuse, D.

doi:10.1109/jqe.1982.1071656

Cited by 94 publications

(6 citation statements)

References 21 publications

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“…Usually, the oscillation-mode stability and SMSR can be numerically evaluated by solving the rate equation for each longitudinal laser cavity mode. 11) In this study, calculation based on the rate equation revealed that the filter extinction ratio of 3. current density, thereby enabling the obtainment of a single longitudinal mode oscillation. In Fig.…”

Section: Tuning Characteristicsmentioning

confidence: 66%

“…However, the crosstalk level is sufficiently low to discriminate the lasing mode and suppress the laser oscillation at an unwanted spectral region because of the difference in gain. 11) On the other hand, the MMI coupler normally has a wavelength-sensitive power splitting ratio, which makes the filter spectral response wavelength sensitive. Since the proposed device has a relatively small number of MMI couplers, it is suitable for achieving a low wavelengthsensitive filter response and low insertion loss.…”

Section: Spectral Characteristicsmentioning

confidence: 99%

“…The threshold current density (J th ) of the diode laser can be numerically calculated by solving a rate equation. 11) Figure 9 shows the calculated J th as a function of the loss of the ladder intracavity filter. In Fig.…”

Section: Tuning Characteristicsmentioning

confidence: 99%

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Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Jeong¹,

Matsuo²,

Yoshikuni³

et al. 2005

Jpn. J. Appl. Phys.

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We propose and demonstrate a novel ladder-type tunable filter cascade-connected by a high-diffraction-order ladder interferometer, and discuss its potential application to a high-performance laser source having high output power and a wide tuning range. We design a novel ladder interferometric tunable filter that satisfies such essential requirements as having a narrow bandwidth for stable single longitudinal oscillation mode control together with a low insertion loss, a low wavelength-sensitive filter spectrum, a wide free-spectral range and a wide tuning range. We successfully demonstrate all of these characteristics in the fabricated device.

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Section: Tuning Characteristicsmentioning

confidence: 66%

Section: Spectral Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Jeong¹,

Matsuo²,

Yoshikuni³

et al. 2005

Jpn. J. Appl. Phys.

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show abstract

“…This is due to the mode hopping caused by the strong intra-cavity resonance of the FP diode laser. 22,23) While the lasing mode of the FP diode laser is outside the 3 dB window of the fiber grating, there is no more mode selection by the external cavity. Figure 8 shows a plot of the SMSR and 0 as a function of the pumping current of the non-AR-coated FGECL at a substrate temperature of 25 C. The 0 showed current-dependent variation, and weak wavelength selection by the fiber grating external cavity.…”

Section: Performance Of the Fiber Grating External Cavity Lasermentioning

confidence: 99%

Low-Cost Fiber Grating Laser Module Package Employing a Hyperbolic Fiber Microlens

Yang¹,

Lee

Chen

et al. 2007

jjap

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The costs of remedial work, and the radon level reduction achieved, have been studied in a series of domestic properties in Northamptonshire, which is a radon affected area. The cost-effectiveness of the series is similar to published theoretical estimates for proposed national remediation programmes, and five times more effective than our similar analysis for the National Health Service workplace, if it is assumed that 100% of householders discovering levels above 300 Bq m −3 implement remediation. In practice, in the UK, far fewer of those who arrange an initial radon test proceed to remediation, but this domestic programme could be cost effective if more than 5% carry out remediation.Our series confirms that a considerable number of householders with radon levels in the 200 to 300 Bq m −3 range do not seek or implement remediation work.

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“…The L-I characteristics were calculated by solving the rate equation. 13) In Fig. 11, we set the initial J th to 3.5 kA/cm 2 , considering the loss of passive intracavity filters and the gain of the SOA.…”

Section: Application To a Widely Tunable Diode Lasermentioning

confidence: 99%

Numerical Demonstration of Wavelength-Insensitive Tuning Characteristics of Ladder-Type Tunable Filter for a Widely Tunable Laser Diode

Jeong

Matsuo

Kakitsuka

et al. 2006

jjap

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The pulse transit time (PTT) of a wave over a specified distance along a blood vessel provides a simple non-invasive index that can be used for the evaluation of arterial distensibility. Current methods of measuring the PTT determine the propagation times of pulses only in the larger arteries. We have evaluated the pulse arrival time (PAT) to the capillary bed, through the microcirculation, and have investigated its relationship to the arterial PAT to a fingertip. To do so, we detected cardiac-induced pulse waves in skin microcirculation using laser Doppler flowmetry (LDF). Using the ECG as a reference, PATs to the microcirculation were measured on the four extremities of 108 healthy subjects. Simultaneously, PATs to the radial artery of the left index finger were obtained from blood pressure recordings using a piezoelectric sensor. Both PATs correlate in similar ways with heart rate and age. That to the microcirculation is shown to be sensitive to local changes in skin perfusion induced by cooling. We introduce a measure for the PTT through the microcirculation. We conclude that a combination of LDF and pressure measurements enables simultaneous characterization of the states of the macro and microvasculature. Information about the microcirculation, including an assessment of endothelial function, may be obtained from the responses to perturbations in skin perfusion, such as temperature stress or vasoactive substances.

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Short-cavity InGaAsP injection lasers: Dependence of mode spectra and single-longitudinal-mode power on cavity length

Cited by 94 publications

References 21 publications

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Low-Cost Fiber Grating Laser Module Package Employing a Hyperbolic Fiber Microlens

Numerical Demonstration of Wavelength-Insensitive Tuning Characteristics of Ladder-Type Tunable Filter for a Widely Tunable Laser Diode

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