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Optic Cable

May 3rd, 2010

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Can a fiber optic cable direct light from the middle of the wire?

if i were to shine a laser pointer at the middle of fiber optic wire, would that light be directed to both ends of the wire? The wire is see through btw. Or does the laser have to be pointed at the ends of the wire?

Fiber optic cables work using the principle of Total Internal Reflection. What happens is that whenever you have a boundary between two different refractive indices, in this case the transparent cable material and whatever's encasing it, there is a critical angle beyond which no light is transmitted across the boundary, and hence all light remains internally reflected. This is why the cable material can be clear (not silvered or reflective), yet still conduct light nearly perfectly down its length by internal reflection. This same effect explains why a right angle prism can be used as a nearly perfect right angle mirror -- you get total internal reflection off the hypotenuse. You can also take note of this next time you're under water in a pool.

So, to answer your question, if you shine light into the side of the fiber then any light that penetrates the material must have entered at less than this critical angle. This means that it will simply exit the other side of the fiber (no total internal reflection) and very little if any will continue down the length of the cable.

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3M 10FT ST to ST Fiber Optic Single Mode Duplex Patch Cable Jumper Cord 9 125
3M 10FT ST to ST Fiber Optic Single Mode Duplex Patch Cable Jumper Cord 9 125
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RS 232 to RS 422 RS 485 Optical Isolation Interface Converter Adapter Cable DG
RS 232 to RS 422 RS 485 Optical Isolation Interface Converter Adapter Cable DG
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15m 5ft 12 Core FC Pigtail Fiber Optic Single Mode Splitter Yellow Cable Cord
15m 5ft 12 Core FC Pigtail Fiber Optic Single Mode Splitter Yellow Cable Cord
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Toshiba Tecra R945 14 SATA Optical Drive Connector Cable A5A003019010 OEM
Toshiba Tecra R945 14 SATA Optical Drive Connector Cable A5A003019010 OEM
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100M FTTH Fiber Optic Drop Cable Patch Cord SC to SC SM Single Core SC SC Jumper
100M FTTH Fiber Optic Drop Cable Patch Cord SC to SC SM Single Core SC SC Jumper
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Dell XT618 Optical Drive SATA Power and Signal Cable for Dell R710 SFF
Dell XT618 Optical Drive SATA Power and Signal Cable for Dell R710 SFF
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Lot of 4 Dell RN657 R610 SATA Slimline Optical Drive Cable
Lot of 4 Dell RN657 R610 SATA Slimline Optical Drive Cable
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CORNING  64 FT  24 STRAND MULTIMODE 50 OM4 TB2 ARMORED FIBER OPTIC CABLE
CORNING 64 FT 24 STRAND MULTIMODE 50 OM4 TB2 ARMORED FIBER OPTIC CABLE
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Mini Professional Hand Tool CFS 2 Fiber Cable Optic Stripper Pliers QC
Mini Professional Hand Tool CFS 2 Fiber Cable Optic Stripper Pliers QC
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Optical Coaxial Toslink Digital DAC Audio to Analog L R RCA Converter With Cable
Optical Coaxial Toslink Digital DAC Audio to Analog L R RCA Converter With Cable
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9Feet OM3 50 125 LC to LC DLX 28mm FIBRE OPTIC DUPLEX PATCH CABLE AQUA UK
9Feet OM3 50 125 LC to LC DLX 28mm FIBRE OPTIC DUPLEX PATCH CABLE AQUA UK
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Fiber Optic Adapter Square Type Bare Fiber Adapter SC Shape Bare Fiber Adapter
Fiber Optic Adapter Square Type Bare Fiber Adapter SC Shape Bare Fiber Adapter
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900M ST ST Indoor Armored Singlemode Duplex Fiber Optic Cable Patch Cord 9 125
900M ST ST Indoor Armored Singlemode Duplex Fiber Optic Cable Patch Cord 9 125
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150M SC SC Indoor Armored Singlemode Simplex Fiber Optic Cable Patch Cord 9 125
150M SC SC Indoor Armored Singlemode Simplex Fiber Optic Cable Patch Cord 9 125
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50M SC SC Indoor Armored Singlemode Duplex Fiber Optic Cable Patch Cord 9 125
50M SC SC Indoor Armored Singlemode Duplex Fiber Optic Cable Patch Cord 9 125
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Fiber Optic Fusion Joint Box for 09mm 025mm Optical Cable White x 10 Pack
Fiber Optic Fusion Joint Box for 09mm 025mm Optical Cable White x 10 Pack
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SC UPC SC APC Fiber Optic OTDR Launch Cable Box 05km SM 1310 1550nm Fiber Rings
SC UPC SC APC Fiber Optic OTDR Launch Cable Box 05km SM 1310 1550nm Fiber Rings
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30M LC LC DUPLEX 10 GIGABIT 50 125 MULTIMODE FIBER OPTIC CABLE OM3 SN T
30M LC LC DUPLEX 10 GIGABIT 50 125 MULTIMODE FIBER OPTIC CABLE OM3 SN T
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HP 2000 329WM 156 Genuine Optical Drive Connector w Cable 35090F700 600 G
HP 2000 329WM 156 Genuine Optical Drive Connector w Cable 35090F700 600 G
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1Mx Optical Digital Audio TOSlink Cable Gold Plated Connections Home Cinema
1Mx Optical Digital Audio TOSlink Cable Gold Plated Connections Home Cinema
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Optical Digital Audio TOSlink Cable SPDIF Gold Plated Connection Home Cinema
Optical Digital Audio TOSlink Cable SPDIF Gold Plated Connection Home Cinema
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Optical Digital Audio TOSlink Cable SPDIF Gold Plated Connection Home Audio
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5Mx Optical Digital Audio TOSlink Cable Gold Plated Connections Home Cinema
5Mx Optical Digital Audio TOSlink Cable Gold Plated Connections Home Cinema
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1M 33FT Premium Digital Audio Optical Optic Fiber Cable Toslink SPDIF Cord
1M 33FT Premium Digital Audio Optical Optic Fiber Cable Toslink SPDIF Cord
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3Meter Optical Digital Audio TOSlink Cable Gold Plated Cable Home Cinema
3Meter Optical Digital Audio TOSlink Cable Gold Plated Cable Home Cinema
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15M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
15M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
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15 Meter Premium Digital Audio Optical Optic Fiber Cable Toslink SPDIF Cord
15 Meter Premium Digital Audio Optical Optic Fiber Cable Toslink SPDIF Cord
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2M 66FT Premium Digital Audio Optical Optic Fiber Cable Toslink SPDIF Cable
2M 66FT Premium Digital Audio Optical Optic Fiber Cable Toslink SPDIF Cable
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2M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
2M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
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1M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
1M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
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5M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
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3 M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
3 M Digital Optical Audio Fiber Optic Cable Audio Cable Male to Male Cord
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BELKIN 15M MTRJ MTRJ 625 125 Duplex Fiber Optic cable F2F20299 15M 800131480
BELKIN 15M MTRJ MTRJ 625 125 Duplex Fiber Optic cable F2F20299 15M 800131480
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SC to FC Optical fiber patch cord jumper cable SM  simplex9 125 100 Meters
SC to FC Optical fiber patch cord jumper cable SM simplex9 125 100 Meters
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HP Envy dv6 7312nr 156 Genuine DVD Optical Drive Connector Cable 504ST04011
HP Envy dv6 7312nr 156 Genuine DVD Optical Drive Connector Cable 504ST04011
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Fiber Optic Cable Corning SCUPC SCUPC 2 fiber 585802H5120065F Blue 65
Fiber Optic Cable Corning SCUPC SCUPC 2 fiber 585802H5120065F Blue 65
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Gateway NV55C57u 156 Genuine DVD Optical Drive Connector w Cable LS 6583P ER
Gateway NV55C57u 156 Genuine DVD Optical Drive Connector w Cable LS 6583P ER
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Original HP 350 355 SATA Optical CD ROM HDD Drive Connector w Cable 6017B0482701
Original HP 350 355 SATA Optical CD ROM HDD Drive Connector w Cable 6017B0482701
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Digital Optic Audio Cable Fiber Optical Lead OD60 Toslink to Toslink 1Meter
Digital Optic Audio Cable Fiber Optical Lead OD60 Toslink to Toslink 1Meter
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