Optical Cable and Accessory for TV CameraFurukawa’s Optical Cable and Accessory”Digital Broadcasting”and”High-Definition TV Broad

Optical composite cable has made remarkable progress.
Furukawa's TV Camera Optical Cable and Accessory
has advanced ahead of the times.

2

for TV Camera Supporting

casting”
I ND E X

Optical Composite Cable
for TV Camera

P. 6

Connector Assembly

P. 8

Installation Part

P.15

Technical Information

P.18

Technical Reference

P.20*1) ARIB stands for Association of Radio Industries and Businesses.
*2) SMPTE stands for The Society of Motion Picture and Television Engineers.

3

Optical Cable and Accessory for TV Camera
An installation example of a TV camera cable and accessory in stadiumis shown here. Optical composite cables for TV cameras are used toconnect different camera positions around the field with the arrayedterminal board on the relay mobile. Employment of an optical cableand accessory for TV camera enables real-time transmission of highquality information.
Connector-Terminated Cable(P.8~9)

C5

Optical Composite Cable for TV Camera(P.6~7, 14)

C4

C5

C4

Connector Assembly(P.10~13)
C3

C6

Installation Part
(P.15~17)

C6

C3

Connector Assembly(P.10~13)

C1 C2 C3

C4 C5 C6

Installation Part

Connector Assembly(P.15~17)(P.10~13)

Design and Executionof Installation Work
(P.20~21)

C1

TV

C2
C1

C2

Optical Composite Cable for TV Camera(P.6~7, 14)

An installation example of a TV camera cable and accessory in astudio is shown here. Camera positions around the studio areconnected with the sub control room using optical composite
cables for TV camera. When patch panel is provided, all kinds ofvideo images on different channels become available. Employmentof an optical cable and accessory for TV camera enables real-timetransmission of high-quality information.

Base Station

C1 C2 C3

Base Station
C4 C5 C6

Optical Composite Cable for TV Camera(P.6~7, 14)

C2

Connector-Terminated Cable(P.8~9)C1

C4Connector-Terminated Cable(P.8~9)C3

C1 C2 C3

C4 C5 C6

Camera Terminal Board

4

Configuration of Optical Composite Cable for TV Camera
Pattern 1● Design of the cable with panel mounting connectors.

Optical composite cable for TV camera
Cable with flanged connector
Cable with flanged connector

Pattern 2● Design of the solution with break out connector and JJ adapter.

optical connector of SC type

J/J
adapterConnector assembly

J/J
adapter

Receptacle

Optical composite
cable for TV camera

Connector assembly

Pattern 3● Design of the solution by FOP unit or fusion splicing unit.
FOP unit

FOP unit
J/J
adapter

J/J
adapter

Fusion spliced point(Fusion splicer)

Optical composite
cable for TV camera

Pattern1

Pattern2

Pattern3

Initial Install cost

◦

△

╳

Initial Install time

◦

◦

△

Cabling by cable ladder

◦

◦

◦

Cabling by Free-access floor

◦

◦

◦

Cabling by cable pipe

╳

╳

◦

Cabling for short length

◦

◦

◦

Cabling for long length

╳

╳

◦

Maintenance cost after install

╳

◦

◦

Remarks

It is up to around 30 m
Easy to change the connector◦ Good△ Fair╳ Poor5

Optical Composite Cable for TV Camera (U.S. Standard: SMPTE)
Type: TV-OM-AMS

Type: TV-OM-SAMS

Description
This composite cable integrates power line for TV
camera, control line, and optical fiber for video andaudio transmission. The cable is standardized by
SMPTE as a cable for TV camera.
* The cable diameter can be changed as requested by using a double
sheath.

Specifications
Structure

Outer sheath
Optical fiberCore number

Power line

3

5

Control line

1
5

6
2

6

4

Applications
Multipurpose cable: TV-OM-AMS
This cable is suitable for wide applications such as fixedinstallation in facilities, relay cable, handy camera cable andpatch cable.
Multipurpose cable: TV-OM-SAMS
This is a cable for large-sized TV cameras in studios. The cablehas a larger outside diameter due to the additional sheath on amultipurpose cable in order not to be jammed between thecamera pedestal dolly and the floor in studios.

3

Binding tape

5

1

1
5

2

Sheath63
5

TV-OM-AMS

TV-OM-SAMS

Optical fiber
Item

Condition

Transmission
loss

λ=1.31 µm

Item
Type of fiber

Characteristics
0.5 dB/km≥

Conversion
Condition (km)FormulaL ≥ 0.4

0.5 x L dB≥

L < 0.4

0.5 x 0.4 dB≥

Description
Single-mode fiber

Mode field diameter

9.0 ± 1 µm

Clad diameter

125 ± 1 µm

Amount of eccentricity

1 µm or less

Cutoff wavelength

1.10~1.35 µm

Coated outside diameter

0.9 ± 0.1 mm

Item
Conductor resistance

Characteristics
37. 5 Ω/km

Insulation resistance

10,000 MΩ·km

Withstand voltage

AC1,750 V/1 min.

Control line
Item

Item
Optical fiber
Power
line
Controlline

Type

TV-OM-AMS

Tin-plated soft copper wire strand(21 wire/0.18 mm)

Conductor
Insulation thickness

0.4 mm nominal
Tin-plated soft copper wire strand(7 wire/0.203 mm)

Conductor
Insulation thickness

Strength memberCore stranding
ShieldCharacteristics

Conductor resistance

113 Ω/km

Insulation resistance

10,000 MΩ·km

Withstand voltage

AC1,750 V/1 min.

TV-OM-SAMS

See Table on the left

0.33 mm nominal
Steel wire: 1.8 mm
Sheath outside diameter: 2.5 mm
Two cores of optical fiber, four cores of powerline and two cores of control line are strandedaround a strength member

Finished outside diameter

Tin-plated soft copper wire braid
Abrasion-resistantAbrasion-resistantsheathsheath (double)
9.2 ± 0.3 mm nominal
16 ± 0.5 mm nominal

Approximate mass

120 kg/km nominal

Operating temp.

270 kg/km nominal-20°C ~ 75°C

Mechanical characteristics
Item* SMPTE stands for The Society of Motion Picture and Television Engineers.

6

Black
White

Cable (integrated)

Sheath (Pb-free)Power line

Red
Gray

Power line

6

Strength member

Blue
Yellow

Control line

44Core color

Optical fiber

2

6

ShieldCore nameCharacteristics

Allowable tension
Allowable bending radius

700 N
Six times the cable outside diameter or larger* These cables meet SMPTE311M.
(TV-OM-AMS : AWM21480)

Optical Composite Cable for TV Camera (Japan Standard: ARIB)
Type: 2SM-9.2-37.5

Type: 2SM-16-37.5

Description
This composite cable integrates power line for TV
camera, control line, and optical fiber for video andaudio transmission. The cable is standardized by ARIB
as a cable for TV camera.
* The cable diameter can be changed as requested by using a double
sheath.
* The cable is available in two kinds: mobile cable for use in studios orrelay fields; and static cable for use in fixed installation.

Specifications
Structure

3

5

2
5

6

Core number

Optical fiber

1

Power line

2

Control line

61

Outer sheath

4

3

Binding tape

5

2
5

6
1

ShieldSheath64

2SM-9.2-37.5

2SM-16-37.5

Optical fiber
Condition

Transmission
loss

λ=1.31 µm

Item
Type of fiber
Mode field diameter

Characteristics
0.5 dB/km≥

Conversion
Condition (km)FormulaL ≥ 0.4

0.5 x L dB≥

L < 0.4

0.5 x 0.4 dB≥

Description
Single-mode silica fiberCore name5

Item
Optical fiber
Power
line

Control Conductorline
Insulation thickness
Strength member

Cutoff wavelength

1.10~1.35 µm

ShieldCoated outside diameter

0.9 ± 0.1 mm

Sheath (Pb-free)Core stranding

Finished outside diameter

Insulation resistance

10,000 MΩ·km

Withstand voltage

AC1,000 V/1 min.

Control line
Item

Type

Conductor

125 ± 1 µm

37.5 Ω /km

Black
White

Insulation thickness

1 µm or lessCharacteristics

Red
Green

Cable (integrated)

Amount of eccentricity

Item

Blue

Power line

6

Clad diameter

Conductor resistanceYellow

Control line

49.0 ± 1 µm

Power line

Core color

Optical fiber

3

Strength member

Item

Applications
Multipurpose cable: 2SM-9.2-37.5
This cable is suitable for wide applications such as fixedinstallation in facilities, relay cable, handy camera cable andpatch cable.
Large-camera cable in studio: 2SM-16-37.5
This is a cable for large-sized TV cameras in studios. The cablehas a larger outside diameter due to the additional sheath on amultipurpose cable in order not to be jammed between thecamera pedestal dolly and the floor in studios.

Approximate mass

2SM-9.2-37.5

2SM-16-37.5

See Table on the left See Table on the left
Tin-plated soft copper wire strand(21 wire/0.18 mm)
0.4 mm nominal
Tin-plated soft copper wire strand(7 wire/0.18 mm)
0.3 mm nominal
Steel wire: 1.8 mm
Sheath outside diameter: 2.5 mm
Two cores of optical fiber, four cores ofpower line and two cores of control line are
stranded around a strength member
Tin-plated soft copper wire braid
Abrasion-resistantAbrasion-resistantsheathsheath (double)
9.2 ± 0.3 mm
16.0 ± 0.5 mm
nominalnominal120 kg/km nominal 270 kg/km nominal

Operating temp.

-20°C ~ 60°C

Note : E CO specification cables (type EM-) are also available exclusively for fixedinstallation.

Mechanical characteristics
Characteristics

Conductor resistance

113 Ω/km

Insulation resistance

10,000 MΩ·km

Withstand voltage

AC1,000 V/1 min.

Item
Allowable tension
Allowable bending radius

Characteristics
700 N
Six times the cable outside diameter or larger* ARIB stands for Association of Radio Industries and Businesses.

7Connector Assembly
Connector-Terminated Cable
Description This cable assembly connects power lines, control lines, and optical fibers. It should be noted thatthey are not compatible with each other. Refer to “Selection Table of Connector and Cable” on thenext page, since each connector has its own attachable cables.

3K series (ARIB and SMPTE standards)
Multipurpose cable

φ28

>
φ24

<Type: FUW-SUS#/AMS****/PUW-SUS

155

150

FUW Plug

PUW Socket
31

27

Cable for large-sized studio camera<Type: FUW-SUS#( )/SAMS****/PUW-SUS( )>Stair-like removal of outer sheath is needed for 3K type connector of large-sizedstudio camera. Please order with the indication of length for removal sheath
more than 400 mm.

Customer specified (1) #, : Green, Black, Red, Gray, Yellow (Color ring)(2) **** : Cable length

OPS seriesMultipurpose cable
φ30.0

>
φ34.0

<Type: OPS-P#/AMS****/OPS-J

126.5

OPS-J Socket

φ31.0

φ30.0

OPS-P Plug

123.0

31.5

33.0

Cable for large-sized studio camera
φ30.0

>
φ34.0

107.0

OPS-SJ Socket

φ30.0

OPS-SP Plug

103.5

31.5

8

φ31.0

<Type: OPS-SP#( )/SAMS****/OPS-SJ

33.0

Customer specified (1) #, : Green, Black, Red, Gray, Yellow, Blue, Pink, White (Color ring)(2) **** : Cable length

Connector-Terminated Cable

Connector series for panel mounting
105

Cable with 3K flanged jack (PBW-SUS)
φ19

φ23

<Type: PBW-SUS>

3
19.5

φ16

4×M3

φ23

Dimensions of mounting

27

23

Cable with 3K flanged plug (FMW-SUS)

105

φ19

φ23

<Type: FMW-SUS>

3
19.5

φ16

4×M3

φ23

Dimensions of mounting

27

20.6

Cable with OPS flanged jack (OPS-PJ)

123.3

φ21

<Type: OPS-PJ>

4×M3

.7

φ21

φ31

23.0

Dimensions of mounting

Cable with OPS flanged plug (OPS-PP)

33

123.3

φ21

<Type: OPS-PP>

4×M3

φ26.4

φ31

23.0

Dimensions of mounting

33

9

Connector Assembly
Selection Table of Connector and Cable
Attachable cable

Product number(LEMO 3K series connector)
Plug connector, FUW-SUS
Socket connector, PUW-SUS

2SM-9.2-37.5
2SM-16-37.5

Panel plug connector, FMW-SUS
Panel socket connector, PBW-SUS

TV-OM-AMS(TAJIMI OPS series connector)

TV-OM-SAMS

Plug connector, OPS-P
Jack connector, OPS-J
Panel plug connector, OPS-PP
Panel jack connector, OPS-PJ

Conversion Connector Series
Description

Every series of 3K, OPS connectors are not interchangeable. Conversion
connectors are needed where different series connectors are used for thecamera head and panel plug receptacles.

Conversion Cable Series
3K
Type

OPS
FUW-SUS#/AMS****/OPS-J※
PUW-SUS※ /AMS****/OPS-P#

Note: When ordering, specify the following in the type number.
	#: Color of ring for the plug side, i.e. G for green or R for red.
※ Color of ring for the jack side, i.e. K for black or N for gray.
****: Length in meter, like 0050 for 50m.

FUW-SUS#/AMS****/OPS-J※

PUW-SUS※ /AMS****/OPS-P#

3K and 5K series are products of LEMO S.A. in Switzerland; and OPS series are products of TAJIMI ELECTRONICS CO., LTD. in Japan.
ARIB stands for Association of Radio Industries and Businesses.
SMPTE stands for The Society of Motion Picture and Television Engineers.

10Cable with other connectors
SC-cord cable

LC-cord cable

SC-connector

LC-connector

ST-connector

Optical characteristics of polished connectors
Type of fiber

SC connector(IEC61754-4)
GI
SM

FC connector(IEC61754-13)
GI
SM

ST connector(IEC60874-10)
GI
SM

LC connector(IEC61754-20)
GI
SM

Transmission loss
(in dB, not more than)PC polished

0.3

0.5

0.3

0.5

0.5

0.5

0.5

0.5

SPC polished

—

0.5

—

0.5

—

0.5

0.5

0.5

Reflection loss
(in dB, not more than)PC polished

25

25

25

25

25

25

25

25

SPC polished

—

40

—

40

—

40

40

40

Type of ferrule polishingType
Flat polishing
Spherical polishing
Angled polishing

Flat

Reflection loss(dB)
Approx. 14

Name of polishing

Physical contact

25 ~ 40

Super physical contact

40 ~ 55

Angled physical contact

60 ~Flat polishing

Spherical polishing

Angled polishing

FerruleOptical fiber

8°

11

Connector Assembly
Receptacle
Description
These connectors are to be placed on the camera head side of the cable seen from the base station. It should
be noted that every series of connectors are not compatible with each other. Pigtail cords are generally provided
with SC connectors and the like for maintenance consideration i.e exchanging components.
3K series (ARIB and SMPTE standards)

OPS series<Type: EDW-SUS/##/****><Type: OPS-R/##/****>

Optical pigtail cord

Dimensions

B

øD

øD

Dimensions

B

A

C

C

A
4-F

4-F

øE

øE

G

Dimensions for mounting

G

Dimensions for mounting

Connector dimensions and Mounting dimensions
TV camera connector
Product
numberEDW-SUS
OPS-R

Optical pin Electric pin
count
count
2
4
2

4

A (mm)B (mm) C (mm) D (mm)E (mm)F

G (mm)

Remarks

29.0

37.5

22.5

23.0

18.2

M3

23.0

3K series, stainless steel

29.0

42.4

26.5

21.3

21.7

M3

23.0

OPS2402-R

Note: When ordering, specify the following in the type number.
## : Type of connector for optical pigtail fiber or cord, such as FC, SC or NN (for cord only).
**** : Length of optical pigtail fiber or cord in millimeter, like 0500 for 500 mm.

3K and 5K series are products of LEMO S.A. in Switzerland; and OPS series are products of TAJIMI ELECTRONICS CO., LTD. in Japan.

12Plug Receptacle
Description
These connectors are to be placed on the base station side of the cable seen from the camera head. It should
be noted that every series of connectors are not compatible with each other. Receptacle and plug connectors
mate with each other as a pair.
3K series (ARIB and SMPTE standards)

OPS series<Type: FXW-SUS/##/****>

Dimensions<Type: OPS-PR/##/****>

Dimensions

øD

øD

øA

B

B
C

A

C

4-F

øE

øE

G

Dimensions for mounting

4-F

Dimensions for mounting

G

Connector dimensions and Mounting dimensions
TV camera connector
Product
numberFXW-SUS
OPS-PR

Optical pin
count2

Electric pin
count
4

2

4

A (mm)B (mm)C (mm)D (mm)E (mm)

38.0

60.0

30.0

38.0

23.0

29.0

43.9

21.0

24.0

26.4

F

G (mm)

Remarks

M3

20.6

3K series, stainless steel

M3

23.0

OPS2404-PR

Note: When ordering, specify the following in the type number.
## : Type of connector for optical pigtail fiber or cord, such as FC, SC or NN (for cord only).
**** : Length of optical pigtail fiber or cord in millimeter, like 0500 for 500 mm.

13

Optical Composite Cable for TV Camera (For Fixed Cabling)
Description

Type: TV-SM-LSZH

This composite cable integrates power line for TV
camera, control line, and optical fiber for video andaudio transmission. For fixed cabling applications, thecable is available: low-smoke emission, halogen-free,
fire-resistant grade.

Specifications
Structure

Optical fiber

3

5Power line
Control line

1
5

6
2

6

Binding tape4

ShieldSheathStrength member

TV-SM-LSZH

Optical fiber
Item

Cable (integrated)

Condition Characteristics

Transmission
λ=1.31 µm
loss

0.5 dB/km≥

Conversion
Condition (km)FormulaL ≥ 0.4

0.5 x L dB≥

L < 0.4

0.5 x 0.4 dB≥

Type
Item
Optical fiber coreConductor
Power line

Item

Description

Type of fiber

Single-mode fiber

Mode field diameter

9.0 ± 1 µm

Clad diameter

125 ± 1 µm

Amount of eccentricity

1 µm or less

Cutoff wavelength

1.10~1.35 µm

Coated outside diameter

0.9 ± 0.1 mm

Control line

Insulation
thickness

0.4 mm nominal

Conductor

Tin-plated soft copper wire strand
(7 wire /0.203 mm)

Insulation
thickness

Strength memberCore stranding
ShieldSheath (Pb-free)Power line
Item
Conductor resistance
Insulation resistanceWithstand voltage

Characteristics
37.5 Ω/km
10,000 MΩ·km
AC1,750 V/1 min.

TV-SM-LSZH
See Table on the left
Tin-plated soft copper wire strand(21 wire/0.18 mm)

Finished outside diameter

0.33 mm nominal
Steel wire: 1.8 mm
Sheath outside diameter: 2.5 mm
Two cores of optical fiber, four cores ofpower line and two cores of control line
are stranded around a strength member
Tin-plated soft copper wire braid
Low smoke-emission,
halogen-free,
flame-resistant
9.2 ± 0.3 mm nominal

Approximate mass

120 kg/km nominal

Mechanical characteristics
Item

Control line
Item
Conductor resistance
Insulation resistanceWithstand voltage
Core number
1
2
3
4
5
6

14

Core name
Optical fiber
Control line
Power line

Characteristics
113 Ω/km
10,000 MΩ·km
AC1,750 V/1 min.
Core color
Blue
Yellow
Red
Gray
Black
White

Allowable tension
Allowable bending radius

Characteristics
700 N
Six times the cable outside diameter or larger

Installation Part
Panel-Integrated FOP Unit
Description
The connector panel and termination box are integrated to create this compact unit. With all optical cords equal inlength, workability is improved and installation methods can be unified without much concern over the terminal board
size during design. Moreover, optical cords can be handled without fear of damage when the panel is removed formaintenance.

FOP Unit
Category

No. of cable

Type number

1

2U
3U

Dimensions (mm)A (height)

B (width)

C (depth)

2U-FOP1/ ＊＊＊ /N

88

142

170

2

2U-FOP2/ ＊＊＊ /N

88

142

170

1

FOP1/ ＊＊＊ /N

132.6

142

110

2

FOP2/ ＊＊＊ /N

132.6

142

110

Frame and connector sold separately.
Please specify the frame of the FOP panel.

FOP2 / ＊＊＊ / N
Code type

Connector makerConnector type3K series
OPS series

A

Cable type
Code type

PBW-SUSLPJ

FMW-SUSLPP

OPS2405-PJ

SPJ

OPS2406-PP

SPP
C

B

Example: FOP2/LPJ/N
Code type specified in the table.

Receptacle type
Connector makerConnector type3K series
OPS series

Code type

Accessories (PCS)
SC cord*1,*2

Metal connector

Splicing sleeve

Housing

Contact set

SC adaptor(DCS)

Groundwire*2(mm)
15

EDW-SUSLR

1

3

1 pair

5

1

FXW-SUSLPR

2

6

2 pair10

2

35

OPS2402-R

SR

1

3

1 pair5

1

15

OPS2404-PR

SPR

2

6

2 pair10235

Note: *1 Applicable to optical fiber with maximized bendability of 15-mm radius. *2 Fire-resistant polyethylene sheath (Eco product)

Example: FOP2/LR/N
Code type specified in the table.

15

Installation Part
Panel-Integrated FOP Unit, Mounting Frame and Related Member
FOP-P (Wall mount type Frame)
Main body dimensions

Mounting dimensions

N

B

D

b

d

120
170

C
A

454
468

c
a

55

Example: FOP-P3

Type number

Unit: mm
Mainbody dimensions Mounting dimensions
a

b

c

d

A

B

C

D

N

FOP-P1

180

170

166

120

150

156

166

120

M4

FOP-P2

325

170

312

120

296

156

312

120

M4

FOP-P3

468

170

454

120

438

156

454

120

M4

FOP-P1/2U

180

126

166

80

150

110

166

80

M4

FOP-P2/2U

322

126

312

80

296

110

312

80

M4

FOP-P3/2U

468

126

454

80

438

110

454

80

M4

Example: FOP-P3

FOP-RP (Rack mount type Frame)
Main body dimensions

Mounting dimensions

132.6
57.15
B

D

b

d

C
A

N
465
483

c
a

Example: FOP-RP3

Type number

Mainbody dimensionsab

FOP-RP3

483

132.6

FOP-RP3/2U

483

88

c

d

Unit: mmMounting
dimensions
A
B
C
D
N

EIA standard size

M5
M5

Example: FOP-RP3

16

55

Panel-Integrated FOP Unit, Mounting Frame and Related Member

H

Blank Panel

W

Type number

W (mm)H (mm)

2U FOP-BP

142

88.0

FOP-BP

142

132.6

FOP Unit with Circuit Breaker
Features
Surge protection circuit has been combined with the panel-integrated optical joint box, i.e. FOP unit, with a size
increase of only 15 mm in the depth.
Peak surge voltage is suppressed by about half, and the total energy, i.e. voltage multiplied by time, down to 0.1 msec
after the outbreak of a surge is reduced by a factor of 7 to 10.
	By manipulating a switch on the panel, the surge ingress circuit is cut off electrically.
Evaluation method: Corresponding to the level 4, i.e. 4 kV x 1.2/50 µsec by IEC61000-4-5 (Surge immunity test)
Output waveform

Applied waveform

4 kV

131.2
142

V: 1 kV/DIV
H: 10 µsec/DIV

140

123.8
132.6 (3U)

V: 1 kV/DIV
H: 10 µsec/DIV

appro. 2 kV

120
105

17

Technical Information
1

What is the optical fiber with maximized bendability ?
This is a novel optical fiber developed by Furukawa Electric which permits flexible optical wiring.
The allowable bending radius for the fiber is 15 mm, one half the conventional values.
The fiber can be jointed with conventional single-mode fibers.
The fiber is in compliance with ITU-T G.652 B standard.
The fiber can be used at a wavelength band of 1280~1625 nm.

2What is single-mode fiber (SM) or multi-mode (GI) fiber?
Graded-index fiber, GI fiber
In graded-index fiber, the refraction index in the core isgraded to gradually increase farther to the center.
Thus, the refractive index at the axis is higher slowing
the speed of light rays, while that near the cladding islower increasing the light speed. Because light speed
is inversely proportional to refractive index, thisreduces the arrival time disparity to have all modes(light rays (1), (2) and (3) in the Figure) arrive at about
the same time, resulting in improved transmission
characteristics or transmission bandwidth. Fibers witha core diameter of 50 µm or 62.5 µm are widely used
at a transmission wavelength of
0.85 µm or 1.3 µm.
Single-mode fiber, SM fiber
Whereas multi-mode fiber supports many modes
within its core, fiber with a much reduced core
diameter of, say 10 µm, can support only thefundamental mode of propagation as shown in the
Figure. There is no waveform distortion due to arrival
time disparity because only one mode propagatesalong the fiber. This type of fiber is called single-mode
fiber, and its refractive index distribution is generally
step-like. Single-mode fiber is suited for high-speed,
high-capacity transmission systems because of its
superior transmission characteristics, and is used at awavelength of
1.31 µm or 1.55 µm, at the former of which ordinary
silica fibers have zero chromatic dispersion.

3

Higherrefractive
index
(3)
(2)
(1)
Exit opticalpulse with
reduced distortion

Incident optical pulse

Higher refractive
index
(2)
(1)
Exit opticalpulse
Incident optical pulse

What is transmission bandwidth?

18

0
-6

[dB]

Amplitude response

In designing optical fiber communication systems, amplitude response in the baseband is used. Transmission
bandwidth refers to a modulation frequency fb, at which the baseband amplitude response expressed as
log|H(fb)| equals -6 (dB). Thus, it gives a rough estimate of up to which frequency the signals are transmitted
without being distorted.
Modulation frequency
fb
[MHz]

4

What is transmission loss?
Taking two points Z1 and Z2 along an optical fiber (Z2 > Z1) and letting the magnitudes of optical intensity atthese points be P1 (Z1) and P2 (Z2), respectively, the transmission loss in this section can be expressed as
α= -log (P2/P1) (dB). Thus, it corresponds to the ratio of optical energy being transmitted at these points. The
transmission loss of an optical fiber comprises absorption loss that turns into heat and scattering loss orradiation loss that leaks out of fiber, and therefore, it depends on the wavelength and spectrum of light source,
incident mode distribution and so forth.

5

What is cutoff wavelength?
Cutoff wavelength of a single-mode fiber is the wavelength above which the fiber supports and propagates only
one mode of light. The cutoff wavelength is dependent on the fiber structure such as refractive index distribution
within the core, core dimension and the like.
What if a heavy Ioad falls onto the optical cable?
The results will depend on what structure the cable you
stepped on has. As for the cables of the Company,
increase in transmission loss generally appears at
approximately 10,000 N as illustrated in the Figure. But
loss increase can appear at around 5,000 N depending on
the structural design or material selection.
Load
Optical power
meterTransmission loss of two fibers (dB)
5.0Transmission loss of two fibers (dB)

6

4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
15,00014,00013,00012,00011,000

9,000

8,000

7,000

6,000

5,000

4,000

3,000

2,000

Load (N)To what degree of bending can an optical cable resist for light transmission?
The Figure shows the performance of our cable using
the new optical fiber with maximized bendability incomparison with that of conventional ones.

Cable with new fiber
Conventional cable
3.5

Transmission loss (dB)

7

100 mm

10,000Light source

1,000

0.0

3.0
2.5
2.0
1.5
1.0
0.5
0.0
60

30

15

10

Cable bending diameter (mm)19Technical Reference
Flowchart from Cable Installation to Completion of Jointing
Cable route confirmation
Does the route have bending?
What about cable installation conditions such as piping, ladder and rack?
Is the distance to power lines sufficient?
Is there no fear of submersion?
Is there any possible influence of small animals including rat?

Specification of terminal board
What is the size of terminal board? Where is the termination box to be placed?
What would be the entry route of the cable into the terminal board?
Is there any coexistence of other cables?
Does the board have door? What would be the situation when in operation?
What is the height of the terminal board from the floor?
Is connector guide bar necessary?

Installation
Is the cable surplus length sufficient for maintenance?
Can the cable be accommodated without any twist or tight bending?
Is the metal cable securely terminated without any loosening or misalignment?
Have the optical fiber fusion splicing procedures been securely carried out?

Inspection
Conduction test

Crossed line test

OK
NG
OK
NG
OK
OK
NG
NG
NG
NG

● Measurement using TDR
NG

NG

OK

NG

20

Withstand voltage test
If not OK, i.e. insufficiently insulated:V• It is likely that water has seeped into the cable.
• It is likely that the cable is collapsed.
• It is likely that water or electrically conductive
substance has entered into the cable.
• Some other reasons.

R

The closer is R to infinity, the better.

Optical power meter method
Measurement ofcalibration valueLightsourceMeasurementLightsourceP0

Power meter
Objectunder test

Power meter

P1

Optical transmission loss of the object under test is |P0-P1|.
Relationship between optical loss and optical intensity
100%

Optical intensity ratio (%)

80%
60%
40%
20%
0%
0

1

2

3

4

5

6

7

8

9

10

Attenuation (dB)

Optical Time Domain Reflectomer (OTDR) method

1. Principle
When an optical pulse is input at one end of an optical fiber, the pulse propagates along
the fiber with its intensity being attenuated due to the radiation and absorption losses. On
the other hand, small portions of the light pulse are reflected by such causes as Rayleighscattering, fiber fracture and the mirror surface at the output end of the fiber, propagatingback to the input end in succession. These reflected pulses represent, when accumulated
over time and displayed on a screen with respect to fiber length, a waveform from whichuseful information on the fiber is obtained including splicing loss, transmission loss, line
length and fault location.
2. Measurement example
An example of line
measurement is shown in
the Figure.

Sharp bend
Spliced point

Fault

Connector

End surface

Spliced point

OTDR
Received optical level (dB)

Optical transmission loss

Distance (km)

21

Note

22

Note

23

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