News Column

"Single Optical Fiber Repeater System" in Patent Application Approval Process

May 22, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventors Chen, Yeongher (Hsinchu, TW); Chang, Haolin (Hsinchu, TW); Li, Yousheng (Chengdu, CN), filed on October 31, 2012, was made available online on May 8, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application is assigned to Browave Corporation.

The following quote was obtained by the news editors from the background information supplied by the inventors: "FIG. 1 shows a schematic view of a conventional optical fiber signal transport system. As shown in FIG. 1, the conventional optical fiber signal transport system includes a first splice terminal 11, a second splice terminal 13, a first optical fiber 21, a second optical fiber 23, a first packet transport device 31 and a second packet transport device 33. First splice terminal 11 is connected to first packet transport device 31. First packet transport device 31 is for generating signals transported from first splice terminal 11, or for processing signals received by first splice terminal 11. Similarly, second splice terminal 13 is connected to second packet transport device 33. Second packet transport device 33 is for generating signals transported from second splice terminal 13, or for processing signals received by second splice terminal 13.

"First splice terminal 11 is connected to first optical fiber 21 and second optical fiber 23. First splice terminal 11 transports signals through first optical fiber 21 to second splice terminal 13 and receives signals through second optical fiber 21 from second splice terminal 13, wherein signals are transported using a same wavelength in first optical fiber 21 and second optical fiber 23.

"In actual deployment, the physical distance between first packet transport device 31 and second packet transport device 33 may be tens of kilometers, or even hundreds. Length L1 of first optical fiber 21 and length L2 of second optical fiber 23 are hard to be identical. Therefore, because of asymmetry in length, an obvious latency problem may occur and lead to delay of processing time data packets by existing operating system (OS), and the time delay is proportional to

"j 2 .pi. .lamda. n Z , ##EQU00001##

"where Z is length. Variation in length will cause change in time delay. To solve the problem of time delay, a usually approach is to use point clock to establish time domain in first splice terminal 11 and second splice terminal 13 to perform compensation.

"However, as the improvement in hardware and expansion of optical fiber system, the time delay situation constantly changes so that the user experience becomes poor and point clock adjustment is constantly required by skilled technicians, resulting in increase in operation cost. Hence, it is desired to devise an improvement over conventional techniques."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "The primary object of the present invention is to provide a single optical fiber repeater system, including a first external device, for generating a first signal; a second external device, for generating a second signal; a first optical fiber sharing apparatus, connected to the first external device, for transporting the first signal from and receiving the second signal to the first external device; a second optical fiber sharing apparatus, connected to the second external device, for transporting the second signal from and receiving the first signal to the second external device; and an optical fiber, connected to the first optical fiber sharing apparatus and the second optical fiber sharing apparatus, for transporting the first signal and the second signal.

"The second optical fiber sharing apparatus converts wavelength of the second signal to a wavelength different from the first signal for transporting in the optical fiber. The first optical fiber sharing apparatus then converts wavelength of the received second signal into a wavelength identical to wavelength of the first signal and then passes to the first external device.

"The first optical fiber sharing apparatus includes a first filter, a second filter, a first splice terminal and a first wavelength convertor. The first filter is connected to the first external device and the first splice terminal. The first splice terminal is connected to the first filter and the second filter. The first wavelength convertor is connected to the second filter and the first external device. The second optical fiber sharing apparatus includes a third filter, a fourth filter, a second splice terminal and a second wavelength convertor. The third filter is connected to the second external device and the second splice terminal. The second splice terminal is connected to the third filter and the fourth filter. The second wavelength convertor is connected to the fourth filter and the second external device. The first splice terminal and the second splice terminal are connected through the optical fiber.

"The first signal generated by the first external device has a first wavelength. The first filter allows the first signal having the first wavelength to be transported through the first splice terminal, the optical fiber and to the second splice terminal, and then through the third filter to the second external device. The second signal generated by the second external device has the first wavelength. The second signal passes through second wavelength convertor and the first wavelength is converted into a second wavelength. The converted second signal having the second wavelength passes the fourth filter to the second splice terminal. At this point, the third filter blocks the second signal having the second wavelength and the second signal passes through the optical fiber to the first splice terminal. The first filter blocks the second signal having the second wavelength, but the second filter allows the second signal having the second wavelength to pass. Then, the first wavelength convertor converts the second signal from the second wavelength into the first wavelength, and then transports the second signal having the first wavelength to the first external device.

"In actual application, the first wavelength and the second wavelength are any different two wavelengths selected from 600 nm to 1700 nm. With a single optical fiber, signals can be transported in different wavelengths. Because the transport and the receiving share the same path, the time delay caused by path length asymmetry can be greatly reduced, and no regular time compensation correction is required; thus, material cost and labor cost are greatly reduced.

"The foregoing and other objects, features, aspects and advantages of the present invention will become better understood from a careful reading of a detailed description provided herein below with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

"The present invention can be understood in more detail by reading the subsequent detailed description in conjunction with the examples and references made to the accompanying drawings, wherein:

"FIG. 1 shows a schematic view of a conventional optical fiber signal transport system;

"FIG. 2 shows a schematic view of the first embodiment of the single optical fiber repeater system according to the invention;

"FIG. 3 shows a schematic view of optical fiber sharing apparatus of the single optical fiber repeater system according to the present invention; and

"FIG. 4 shows a schematic view of the second embodiment of the single optical fiber repeater system according to the invention."

URL and more information on this patent application, see: Chen, Yeongher; Chang, Haolin; Li, Yousheng. Single Optical Fiber Repeater System. Filed October 31, 2012 and posted May 8, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3615&p=73&f=G&l=50&d=PG01&S1=20140501.PD.&OS=PD/20140501&RS=PD/20140501

Keywords for this news article include: Browave Corporation.

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Source: Politics & Government Week


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