Laser Diode to Single Mode Circular Core Graded Index Fiber Excitation via Hemispherical Microlens on the Fiber Tip: Identification of Suitable Refractive Index Profile for Maximum Efficiency with Consideration for Allowable Aperture
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Ashima Bose
und
Subhas Chandra Saha
Abstract
Based on the prescribed ABCD matrix for refraction by hemispherical lens under paraxial approximation, we formulate an analytical expression of coupling efficiency of a laser diode to a single mode circular core graded index fiber via a hemispherical lens on the tip of the fiber. The analysis involves Gaussian field distribution for both the source and the fiber and consideration of allowable aperture provided by the hemispherical lens. In order to find out the suitable refractive index profile for maximum coupling efficiency, we investigate the coupling optics for different profile exponents in graded index refractive index profile. In this context two different laser diodes emitting wavelengths 1.3 μm and 1.5 μm are employed for the concerned study. It is found that the graded index fiber having triangular refractive index profile is the most efficient one for the said two wavelengths of practical importance. Our formalism is simple and executable with little computation. The results found should be of tremendous importance to the designer of such coupling in the field of optimum launch optics.
©2012 by Walter de Gruyter Berlin Boston
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Artikel in diesem Heft
- Masthead
- Editorial
- Photo Parametric Amplifier Using Up & Down Converter Configuration for Optical Receiver
- Monitoring and Compensation of Optical Telecommunication Channels by using Optical Add Drop Multiplexers for Optical OFDM System
- Laser Diode to Single Mode Circular Core Graded Index Fiber Excitation via Hemispherical Microlens on the Fiber Tip: Identification of Suitable Refractive Index Profile for Maximum Efficiency with Consideration for Allowable Aperture
- Routing Algorithm based on Minimum Spanning Tree and Minimum Cost Flow for Hybrid Wireless-optical Broadband Access Network
- Performance Comparison of Coherent Time-spreading and Spectral Phase Encoding OCDMA Systems
- Development of a New Class of Zero Cross Correlation Codes for Optical CDMA Systems
- Distribution of DVB-C Channels over an Externally Modulated Optical Link
- Self-Phase Modulation Effect on Performance of 40 Gbit/s Optical Duty-Cycle Division Multiplexing Technique
- A Recursive Algorithm for a Non-uniform Amplitude Beam Propagating Through a Sub-wavelength Grating
- Re-evaluation of “;The Propagation of Radiation in the Spherical Wave Form”
