High-power optical amplifier for optical interorbit communications

Araki, Takao; Hisada, Yasumasa; Tajima, Y.

doi:10.1117/12.238427

Cited by 3 publications

(1 citation statement)

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“…A great deal of research on solving the filamentation problem has been performed on LD amplifiers [5,6], and LD amplifiers for intersatellite optical communications have been developed [7,8]. These diodes obtained a singlepeak FFP of 1 W or more, but compared to a single LD element, the oscillation threshold becomes high and the conversion efficiency drops.…”

Section: Introductionmentioning

confidence: 99%

Radiation characteristics analysis of broad area laser diodes and the proposal of improvement methods

Morimoto

Toda

Takano

2002

Electron Comm Jpn Pt II

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SUMMARYIn a broad-area laser diode (LD) having a wide stripe width, a Gaussian pattern is not obtained in the near field (NFP) and the far field pattern (FFP) has multiple peaks, which is known as filamentation. Thus, when used in communications, the losses in the side lobes are large, and antenna directivity problems develop. In this paper, we solve the wave motion equation and the dispersion equation to explain the radiation characteristics during filamentation. In particular, we explain the relationship between the phase distribution at the LD facets and the NFP and FFP. We also investigate the improvements in the radiation characteristics by examining the phase distribution at the facets and the injected current distribution in the direction perpendicular to the wave propagation direction. The results showed that the FFP can be a single peak with a side lobe suppression ratio of 13.4 dB when phase correction having two peaks was performed at the facets. The results also showed effective narrowing of the current distribution.

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Section: Introductionmentioning

confidence: 99%

Radiation characteristics analysis of broad area laser diodes and the proposal of improvement methods

Morimoto

Toda

Takano

2002

Electron Comm Jpn Pt II

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Degradation of single-mode fiber coupling efficiency due to localized wavefront aberrations in free-space laser communications

Zhao

Tan

et al. 2010

Opt. Eng

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Plane wave coupling into single-mode fiber in the presence of random angular jitter

Zhao

Tan

et al. 2009

Appl. Opt.

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Efficient coupling of coherent plane waves into single-mode fibers is a key technology for free-space optical communication at 1550 nm. Here we deal with the influence of random angular jitter on a plane wave to single-mode fiber coupling. The expression of mean-coupling efficiency in the presence of random jitter is handled in the pupil plane. First, an analytical expression of the mean-coupling efficiency is derived for the zero bias error case. Then the bias error was taken into account. By minimizing the coupling efficiency penalty, the optimum value of design parameter beta of fiber-coupled optical systems in the presence of random jitter is obtained. The results obtained here will be useful in facilitating parametric estimation and optimization of fiber-coupled optical systems.

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High-power optical amplifier for optical interorbit communications

Cited by 3 publications

References 0 publications

Radiation characteristics analysis of broad area laser diodes and the proposal of improvement methods

Radiation characteristics analysis of broad area laser diodes and the proposal of improvement methods

Degradation of single-mode fiber coupling efficiency due to localized wavefront aberrations in free-space laser communications

Plane wave coupling into single-mode fiber in the presence of random angular jitter

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