Synchronous parallel optical-fiber transmission is an attractive method for providing increased interconnection throughput and higher density in advanced information systems. Skew suppression (reducing transmission delay time variation), error-free fully DC-coupled data transmission capability, compactness, and low power consumption of modules are important requirements. In order to meet these requirements, we developed optical subsystem interconnections using long-wavelength laser diode arrays and single-mode fiber arrays. The major design criteria are discussed, especially as they are related to skew due to laser diode turn-on delay and receiver input optical power variation. The use of low-threshold-current laser diode arrays is an important design requirement. Based on the design criteria discussed in this work, we demonstrated 8-channel 200-Mb/s/ch 100-m transmission using compact (0.18 cc/ch/module), low power (total 280 mW/ch), fully integrated transmitter and receiver modules with an ECL (emitter coupled logic) interface. These modules include our new laser diode arrays with low threshold current of 3.2 mA. Performance results showed that these modules are very effective as interconnections between synchronously operating subsystems.
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.
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