摘要:

AbstractIn this paper the crosstalk penalty for a DPSK FDM system is evaluated by an accurate analytical model taking into account the laser phase noise. The results are also compared with those obtained in the presence of phase noise from the Gaussian approximation to assess the conditions under which this simple algorithm can be used to evaluate the crosstalk induced penalty.

ISSN:0895-2477    

DOI:10.1002/mop.4650030502

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe phase‐shift position (PSP) of a λ/4‐shifted distributed feedback (DFB) laser diode affects many characteristics of the laser. In particular, the effects of PSP on stability and external differential quantum efficiency for single longitudinal mode (SLM) operation of the laser were investigated previously by many authors. In this letter, a theoretical analysis of the effect of PSP on the spectral linewidth of the laser is presented. The results revealed the necessity of trade‐off in optimizing the PSP for a laser diode with a narrow linewidth while maintaining a sufficient stability and effi

ISSN:0895-2477    

DOI:10.1002/mop.4650030503

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractIn this paper, the problem of electromagnetic scattering by a conducting body of revolution is solved using the finite‐difference technique in frequency domain. Two coupled partial differential equations, derived based on the coupled azimuthal potentials introduced by Morgan, Chang, and Mei are solved over a domain surrounding the scatterer. Boundary‐fitted curvilinear coordinates, which avoid the problem of staircasing, are used to discretize the domain of computation. Results are presented to demonstrate the accuracy of the met

ISSN:0895-2477    

DOI:10.1002/mop.4650030504

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe finite element and the finite difference methods are applied to Monte Carlo simulations of random rough surface scattering. The advantages of these methods are the banded nature of matrix and the reduction of computer time. These results are also compared with those of Kirchhoff approximation and those of small perturbation theory when applicable.

ISSN:0895-2477    

DOI:10.1002/mop.4650030505

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractTime domain linear analysis on an improved finite‐difference discretization scheme is proposed as an efficient technique for the small‐signal simulation of semiconductor devices. In particular, we apply the method to the case of MESF

ISSN:0895-2477    

DOI:10.1002/mop.4650030506

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe analysis of antipodal and asymmetrical bilateral finlines has been developed. In this method, the propagation constant is achieved via the singular integral equation (SIE) technique. Compared with other methods, it is an accurate method and needs less computer time.

ISSN:0895-2477    

DOI:10.1002/mop.4650030507

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractA new variational functional for lossy open and dielectric waveguides has been derived. Based on the functional, a nonstandard variational method in terms of longitudinal fields has been introduced for calculating attenuation due to material losses. The method has been tested on a round step‐index optical fiber possessing various complex refraction index profile

ISSN:0895-2477    

DOI:10.1002/mop.4650030508

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractAn algorithm based on the recursive operator algorithm is proposed to solve for the scattered field from an arbitrarily shaped, inhomogeneous scatterer. In this method, the scattering problem is first converted to an N‐scatterer problem. Then, an add‐on procedure is developed to obtain recursively an (n + 1)‐scatterer solution from an n‐scatterer solution by introducing an aggregate τ matrix in the recursive scheme. The nth aggregate τ(n)matrix introduced is equivalent to a global τ matrix for n scatterers so that in the next recursion, only the two‐scatterer problem needs to be solved: One scatterer is the sum of the previous n scatterers, characterized by an nth aggregate τ(n)matrix; the other is the (n + 1)th isolated scatterer, characterized by τn + 1(1). If M is the number of harmonics used in the isolated scatterer T matrix and P is the number of harmonics used in the translation formulas, the computational effort at each recursion will be proportional to P2M. (Here we assume M is less than P.) Consequently, the total computational effort to obtain the N‐scatterer aggregate τ(N)matrix will be proportional to P2MN. In the low‐frequency limit, the algorithm is linear in N because P, the number of the harmonics in the translation formulas, is independent of the

ISSN:0895-2477    

DOI:10.1002/mop.4650030509

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractApproximate formulae for the radial wave numbers of the surface wave modes in a grounded dielectric structure are presented. These were obtained by using the concept of successive approximation iteration scheme. Numerical results compare well with the actual values of the surface wave number.

ISSN:0895-2477    

DOI:10.1002/mop.4650030510

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractA low‐cost, easy to fabricate waveguide‐to‐microstrip E‐probe transition for the entire × band is introduced. Experimental data shows the E‐probe transition to be broadband with low insertion loss. The design of a test fixture to characterize accurately a single waveguide‐to‐microstrip transition is

ISSN:0895-2477    

DOI:10.1002/mop.4650030511

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY