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Multimode optical system

An optical system and multimode optical fiber technology, applied in the field of optical fiber transmission, can solve the problems of reducing the signal-to-noise ratio and not solving the modal dispersion wavelength dependence of the optical fiber propagation mode

Active Publication Date: 2010-06-16
DRAKA COMTEQ BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this filtering is that it reduces the signal-to-noise ratio
Also, it does not address the wavelength dependence of the modal dispersion of each fiber propagation mode

Method used

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Embodiment Construction

[0044] The present invention proposes an optimized multimode optical system for use with polychromatic sources with multiple transverse modes, such as VCSEL lasers.

[0045] figure 1 The emission spectrum of a VCSEL laser with a mode centered at 850 nm for excitation of the fundamental mode LP01 is shown. figure 1 Each transverse mode of the laser is shown to have its own wavelength. The maximum RMS spectral width generally approved for high bandwidth transmission is 0.45nm RMS for VCSELs (as defined in the standard IEEE 802.3ae).

[0046] Therefore, when an optical signal emitted by a VCSEL is introduced into a multimode fiber, each transverse mode of the VCSEL will diffract differently: the highest order transverse modes diverge faster due to their phase and the spatial distribution of their energy, Therefore, they will couple more specifically into fiber higher-order modes. It will be recalled that the higher order modes of a VCSEL occupy the lowest wavelengths in the sp...

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Abstract

An optical system comprises a polychromatic optical source (10) emitting multiple transverse modes, an optical link comprising at least one portion of multimode optical fibre (50) and an optical device (20) positioned between the optical source (10) and the input of the multimode optical fibre (50). The optical device (10) is suitable for modifying the distribution of the energy coupling of the transverse modes emitted by the source in the propagation modes of the fibre The system of the invention makes it possible to use low-cost transverse multimode optical sources for producing high-bandwidth Ethernet transmission networks having very good performances.

Description

technical field [0001] The present invention relates to the field of optical fiber transmission, and more particularly to short-distance optical transmission systems requiring wide bandwidth. Background technique [0002] Multimode fiber is typically used for short-distance applications and local area networks. The core of a multimode fiber typically has a diameter of about 50 μm and a numerical aperture greater than 0.2, compared to the core of a single-mode fiber which has a diameter of 8 to 9 μm and a numerical aperture of 0.12. Thus, for a particular wavelength, multiple optical modes carrying the same information propagate simultaneously along the fiber. Bandwidth is directly related to the group velocity of the optical modes propagating in the fiber's multimode core. To guarantee wide bandwidth, the group velocity of all modes needs to be the same; in other words, for a particular wavelength, the intermodal dispersion, ie, the difference in group velocity between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/42H04B10/13H04B10/18H04B10/2507H04B10/2581
CPCH04B10/2507H04B10/2581
Inventor A·格霍拉米D·莫兰P·西亚尔Y·吕米纳奥
Owner DRAKA COMTEQ BV