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Optical substrate coupler with positive feedback and mode changing

A mode conversion and connector technology, applied in optics, optical components, instruments, etc., can solve problems such as optical technology limitations

Inactive Publication Date: 2007-10-24
IBM CN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adoption of optical technologies in backplanes will be limited unless optical backplane connectors can equally assure connections provided by current electrical connectors

Method used

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  • Optical substrate coupler with positive feedback and mode changing
  • Optical substrate coupler with positive feedback and mode changing
  • Optical substrate coupler with positive feedback and mode changing

Examples

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Embodiment Construction

[0027] Referring now to FIG. 1, this diagram illustrates a simplified form of electronic circuitry, such as circuitry used to route signals in a large-scale computer architecture. The portion shown is a set of connections between boards or devices in the system. Boards 102-1, each including a typical logic or signal processing module 104-1, are connected by ribbon cables 115-1. The optical fibers in such cables are generally single-mode optical fibers, while the waveguides formed in the substrate by lithographic techniques are multi-mode. The core diameter is much smaller than the standard waveguide size of 50-250 microns, and the fiber outer diameter is also smaller than 125 microns. Single-mode fiber is 9 microns in diameter, multimode fiber is 50 or 62.5 microns in diameter, and most plastic optical fibers are 100 microns or less in diameter.

[0028] The illustrated examples are applicable to both 850nm lasers and 1300nm or 1550nm lasers in the multimode fiber / waveguide ...

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Abstract

A connector system for fiber optic cables employs an interface module located between the cable connector and the system component receiving the optical signals that converts the single-mode light on the cable to a mixture of modes that fill a multi-mode waveguide on the system board, thereby reducing modal noise and differential mode delay. A particular connector produces an electrical signal reflecting whether the optical connection is within specifications.

Description

technical field [0001] The invention relates to the field of optical fiber connection, in particular to the connection of a fiber ribbon cable to a module on a circuit board. Background technique [0002] The need to interconnect optical backplanes into large servers (520 terabit capacity) will be prominent over the next 25 years. [0003] It has long been recognized that long-distance (>1 km) fiber optic links using 850nm, 1300nm or 1500nm laser sources require mode conditioning. For example, the IEEE 802.3z Gigabit Ethernet standard specifies the use of offset launch mode conditioners when using 1300nm laser light sources (optimal for single-mode fiber) on multimode fiber optic line equipment, and does not would result in excessive pattern noise and differential pattern delay, including phase noise generating biterror rate floors (see for example, Optical Engineering on Fiber OpticData Communications Special Issue, vol.37, no.12, 1998 12 moon). The same problem will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/36G02B6/14G02B6/30G02B6/38G02B6/42G02B6/43
CPCG02B6/4292G02B6/389G02B6/43G02B6/425G02B6/4206G02B6/30G02B6/14
Inventor 劳伦斯·雅各博维茨约翰·U·尼克博克卡西默·M·德库萨蒂斯卡梅伦·J·布鲁克斯
Owner IBM CN