Dependence of high-speed properties on the number of quantum wells in 1.55 mu m InGaAs-InGaAsP MQW lambda /4-shifted DFB lasers

Abstract

Optical Gain Formulas for 1.55 pm Strained Quaternary Quantum Well Lasers," IEEE J. Quantum Electron., to be published. Received 1-20-95 Microwave and Optical Technology Letters, 9/3, 153-156 0 1995 John Wiley & Sons, Inc. CCC 0895-2477/95divergence condition at the cost of losing the sparsity of the matrices. Lee [7] employed a hybrid vector finite-element method, in which edge elements and first-order nodal finite element basis functions are used to span the transverse and the z components of the electric field, respectively. The complex propagation constants are obtained directly in the formulation.In this article we employ TVFEMs and extend their applications to lossy anisotropic media, or more specifically, media with diagonal permittivity and permeability tensors. Formulation in terms of vector and scalar potentials is derived from Maxwell's equations. By imposing the Galerkin procedure, the matrix equation for complex propagation constants and eigenvectors is obtained. To verify the accuracy of the method, three examples are given. The results obtained by the modified Lanczos algorithm are compared with previously published results. ABSTRACT Problems of biaxialb anisotropic waveguides with ahitrary cross section are formulated in terms of uector and scalar potentials, By using the tangential vector finife elements, electromagnetic characteristics of propa-gating modes in the waveguides are obtained without the occurrence of any spuious modes. Numerical results are verified and agreements with other published results are achieved. 0 ABSTRACT The performance of the coherent heteroene optical FM recewer employing a discriminator has been simulated under different i$ filter band-widths to find the optimal bandwidth. The value of the signal-to-noise ratio has been obtained under different values of i.f filter bandwidth, modulation index, and signal power. The phase noise linewidh is jiwd at Av = 10 kHz. Euen for very small linewidth, the performance of the coherent optical FM recewer is mainly dominated by phase noise. The advantage of FM modubtion exists only when received signal power is small. 0 1995 John Wley & Sons, Inc.

Single-mode operation over a wide temperature range in 1.3 μm InGaAsP/InP distributed feedback lasers

“…When the active region is formed from a stack of thin strained QW's, the electrons which escape from the first few wells by thermionic emission have a chance to be recaptured by the next wells, thus reducing the temperature sensitivity of the threshold current [3 11 and improving the bandwidth [32], [33]. Fig.…”

<title>Microfabrication of vertical-cavity surface-emitting laser cavities</title>

“…The threshold current density th was estimated to be 50 and 35 kA/cm2 for 5x7prn2 and 7x1Oim2 devices, respectively, which was about 5 times higher than the theoretically predicted value. This discrepancy may be caused by non uniform current injection into the active layer which results from the lateral diffusion in both the p and n cladding layer [11]. …”

Dynamic properties of partly gain-coupled 1.55-μm DFB lasers

“…However, the single-mode yield is low due to the random facet phase introduced by cleaving [4]. Another approach is to incorporate a X/4 phase-shifted region in the middle of the laser cavity in combination with low AR coating on both facets [5], [6] to achieve a high dynamic single-mode yield, but the device performance is more sensitive to spatial holeburning [7].…”