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Optical communication system

An optical communication system and optical communication module technology, applied in transmission systems, electromagnetic wave transmission systems, optics, etc., can solve problems such as limiting wavelengths and systems, complex optical systems, and increasing costs.

Inactive Publication Date: 2003-04-16
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the method (1) of performing optical amplification increases the cost and limits the wavelengths and systems to be used
Therefore, the application of this method is limited to the mainline system, and it is difficult to apply the method to a short-distance optical communication system using a transmission medium such as POF
[0013] (2) When using AGC, the circuit is complicated
However, it does not disclose any solution to the problem that the amount of received light varies with the transmission distance and the dynamic range increases
Moreover, according to its disclosed technology (the numerical aperture of the optical communication module is smaller than that of the optical fiber), if a light-emitting diode (LED) with a large radiation angle is used as a light-emitting element, the optical system becomes complicated, which makes it difficult to realize optical communication Module size reduction and cost reduction

Method used

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Examples

Experimental program
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no. 1 example

[0074]Fig. 5 is a schematic diagram showing an example of a system employing the optical communication system of the present invention. This optical communication system 3 is designed to connect two personal computers (hereinafter referred to as "PC") 15-1 and 15-2 and electronic equipment 16, such as a digital video camera, a digital steel camera, a portable Information terminal, printer or digital TV. PC15-1 has built-in optical communication modules 1-1 and 1-3. The PC 15-2 and the electronic device 16 have built-in optical communication modules 1-2 and 1-4, respectively. The optical communication modules 1-1 and 1-2 use the longer transmission distance optical fiber 2-1 as the transmission medium to perform bidirectional optical communication between PC15-1 and PC15-2. Also, between the PC 15-1 and the electronic device 16, the optical communication modules 1-3 and 1-4 perform bidirectional optical communication using the short transmission distance optical fiber 2-2 as ...

no. 2 example

[0100] Below, refer to Figure 17 A second embodiment of the optical communication system of the present invention is described. Figure 17 In , components with the same or similar functions as those in FIG. 5 are denoted by the same numerals and will not be described again.

[0101] In the first embodiment, the optical fibers 2-1 and 2-2 have the same numerical aperture NAp (that is, the optical fiber 2 having the same characteristics irrespective of the difference in transmission distance is used). In contrast, in the second embodiment, optical fibers 2-3 and 2-4 having different numerical apertures NAp1 and NAp2 depending on the transmission distance are used.

[0102] In the second embodiment, the numerical aperture NAf of the received light does not change with the numerical aperture NAs of the emitted light and the numerical aperture NAp of the optical fiber 2, but the optical fibers 2 (2-3 and 2 -4).

[0103] As described above, the numerical aperture NAf of the rece...

no. 3 example

[0107] Below, refer to Figure 18 and 19 A third embodiment of the optical communication system of the present invention is described. Figure 18 and 19 In , components with the same or similar functions as those in the first and second embodiments are denoted by the same reference numerals and will not be described again.

[0108] The present embodiment focuses on an optical communication system suitable for coexistence of optical communication modules 1 of different communication speeds or different optical characteristics. As an example, discuss Figure 18 Shown is an optical communication system 3 in which two optical fibers 2 (2A, 2B) are used to provide bidirectional optical communication. Optical communication is provided between the first optical communication module 1A and the second optical communication module 1B using the optical fiber 2 (2A, 2B) as a transmission medium. The optical fiber 2A is used for transmission from the first optical communication module...

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PUM

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Abstract

Numerical aperture of transmitted light is varied to NAs by a transmitting lens. The numerical aperture, NAs, of the transmitted light is made larger than the numerical aperture, NAp, of an optical fiber, whereby the numerical aperture, NAf, of received light radiated from the optical fiber is made smaller as the transmission distance increases. A receiving optical system is arranged such that the receiving efficiency of the received light is increased by the provision of an aperture member according as the numerical aperture, NAf, is made smaller. This improves the receiving efficiency when the transmission distance is long and reduces a variation in the received light quantity even if the transmission distance is varied.

Description

Background of the invention [0001] The present invention relates to an optical communication system capable of transmitting and receiving optical signals via an optical fiber serving as a transmission medium. In particular, the present invention relates to an optical communication system that can be used for domestic communication, communication between electronic devices, LAN (Local Area Network) and the like. [0002] With the development of information society, network technology using optical fiber has become the focus of the public. In particular, an optical communication system using plastic optical fiber (hereinafter referred to as POF) as a transmission medium for domestic communication, LAN and communication between electronic devices has been developed. [0003] Fig. 22 shows an example of the above-mentioned type of optical communication system. The optical communication system 103 has an optical fiber 2 for emitting modulated light suitable for transmission accor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25G02B6/42H04B10/2507H04B10/2581
CPCG02B6/4246G02B6/4214G02B6/4206
Inventor 藤田英明石井赖成田村壽宏
Owner SHARP KK
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