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Low insertion loss, low back reflection fiber optic rotary joint with increased data throughput

a low back reflection, data throughput technology, applied in the direction of optics, instruments, optical light guides, etc., can solve the problems of reducing the performance of the unit, reducing the range at which a signal can be sent, and refraction is a source of chromatic dispersion

Active Publication Date: 2015-03-12
PRINCETEL
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practice this refraction is a source of chromatic dispersion because optical signals have a finite spectral range.
Therefore, the frequency at which a signal can be sent is limited by the width of each wave, or the amount of dispersion that occurs in the signal.
Conversely, the performance of the unit will degrade the farther the operating wavelength is from the wavelength at which the unit was tuned.
The cause of this lower limit is that in practice every light source has a finite spectral range around the nominal wavelength.
This theoretically reduces the efficiency with which the opposing collimator could recapture the signal, thereby putting a theoretical limit on the lowest achievable insertion loss.
However, as Ames correctly indicated in U.S. Pat. No. 5,157,745; the Pechan prism suffers from high back reflection.

Method used

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  • Low insertion loss, low back reflection fiber optic rotary joint with increased data throughput
  • Low insertion loss, low back reflection fiber optic rotary joint with increased data throughput
  • Low insertion loss, low back reflection fiber optic rotary joint with increased data throughput

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[0012]Dove prisms are used to invert an image and when they are rotated about their longitudinal axis, the transmitted image rotates at twice the rate of the prism (see FIG. 1). Therefore, if the prism rotates at half the rate of a rotating object, the image, after passing through the prism, will appear to be stationary. FIG. 1 is the schematic drawing of de-rotating Dove prism in the prior art. The image (2) of an object (1) is inverted by the Dove prism (10). Furthermore, if the prism (10) is rotated about the optic axis (3), the image (2) rotates at twice the rate of rotation of Dove prism (10).

[0013]FIG. 2 illustrates the imaging principle of the coated Pechan prism in the present invention. The image (152) of an object (151) on the entrance side of a coated Pechan prism (157) is inverted in a similar way as the Dove prism (10) in FIG. 1. However, there is one critical difference; there are no refractive elements in the optical path of the coated Pechan Prism. As a result, there...

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Abstract

A low insertion loss, low back reflection fiber optic rotary joint with increased data throughput capabilities has been invented. This is accomplished by using a dispersion free prism with optical coatings to minimize the amount of back reflection caused by the optical beam passing through the prism-air interface.

Description

BACKGROUND OF THE INVENTION[0001]A typical rotary joint consists of a fixed collimator holder and a rotatable collimator holder which are relatively rotatable to each other to allow uninterrupted transmission of optical signals through the rotational interface from collimators in any one of the holders to the collimators in the other holder.[0002]A multi-channel fiber optic rotary joint typically utilizes a dove prism and a gear box as the de-rotating mechanism between the fixed collimator holder and the rotatable collimator holder. It typically rotates at half the rotational speed of the rotatable collimator holder; effectively de-rotation the image.[0003]The dove prism relies on refraction to bend the optical beam as part of the de-rotation, which theoretically should not cause a problem. However, in practice this refraction is a source of chromatic dispersion because optical signals have a finite spectral range. Since the angle of refraction is a partial function of the wavelengt...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B6/36
CPCG02B6/3604
Inventor ZHANG, HONGZHANG, BOYING B.VIOLANTE, LOUIS D.
Owner PRINCETEL