What is an optical Coupler ?

An optical coupler is a passive optical component that able to combine or split transmission data (optical power) from optical fibers.

Plank is a leading fused coupler company in the industry and ability to supply the high reliability coupler on the market. Plank coupler products come with compact size, Low Insertion Loss, Bi-directional and Environmentally Independent features.

Plank also Provides WDM System Integration service for our worldwide customers, the integration module could be ABS box, LGX box, Rackmount Chassis or any other custom defined housing.

For further information, please get the specification sheets at download zone.

Multi-Mode Coupler	Multi-Mode Star & Tree Coupler
Single Mode Dual-window Coupler	Single Mode Dual-window Star & Tree Coupler
Single Mode Dual-window Miniature Coupler	Single Mode Dual-window Low WDL Coupler
Single Mode Single-window Coupler	Single Mode Single-window Narrow Band Coupler
Single Mode Single-window Star & Tree Coupler	Single Mode Single-window Ultra Low PDL Coupler
Single Mode Single-window 1x3 & 1x4 Tube Coupler	Single Mode Single-window 1x3 & 1x4 Narrow Band Tube Coupler
Monolithic Single-mode 1x3 and 1x4 Coupler ; Triple Windows (1310/1490/1550)	PLC Splitter (Coupler) 1x8 1x16 1x32

Multi-Mode Coupler

1x2, 2x2, Multi mode, Standard Coupler
Parameters	A Grade	B Grade
Operating Wavelength(nm)	850 & 1310
Excess loss (dB)	0.7	1.0
Uniformity (dB)	≤ 0.8	≤1.0
Coupling Ration (%)	1 : 99 to 50 : 50
Directivity (dB)	>35
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-50 to +85
Temp. Coefficient (dB/°C)	<0.002( Max.)
Dimensions (mm)	Bare fiber: 3.0 (Ф) x 54 ( L ) Loose tube: 3.5(Ф) x 65 ( L ) PVC: 95(L) x 12(W) x 10(H)
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	A Grade	B Grade
50 : 50	3.9	4.3
40 : 60	4.9/3.0	5.4/3.5
30 : 70	6.2/2.3	6.7/2.7
20 : 80	8.0/1.6	8.7/2.1
10 : 90	11.3/1.1	12.2/1.6
5 : 95	14.9/0.9	16.2/1.3
1 : 99	22.1/0.7	22.7/1.0
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Multi-Mode Star & Tree Coupler

Multi mode, Star and tree Coupler
Parameter		1x4	4x4	1x8	8x8	1x16	16x16	1x32
Operating Wavelength(nm)		850 &1310
Coupling ratio (%)		Average
Max. Insertion loss (dB)		7.7	8.4	11.5	12.5	15.5	17.0	18.0
Uniformity (dB)		≤1.2	≤1.5	≤1.8	≤2.0	≤2.4	≤2.6	≤3.0
Directivity (dB)		>35
Operation temp.(°C)		-40 to +70 *
Storage temp.(°C)		-50 to +85
Temp. Coefficient (dB/°C)		<0.003		<0.004		<0.006
Dimension (mm)	ABS box	100(L)x80(W)x10(H)		140(L)x90(W)x10.7(H)
	Metal box	LGX Module 19" 1U Chassis		LGX Module or 19" 1U Chassis		LGX Moduler 19" 1U Chassis 19" 2U Chassis
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC, FC, ST, LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Dual-window Coupler

1x2, 2x2, Single mode, Dual window Wideband+/-40nm
Parameters	A Grade	B Grade
Operating Wavelength(nm)	1310 & 1550 (+/-40)
Excess loss (dB)	0.2	0.3
Uniformity (dB)	≤ 0.8	≤ 1.2
Coupling Ration (%)	1 : 99 to 50 : 50
Polarization Stability (dB)	0.15	0.2
Directivity (dB)	>55
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-50 to +85
Temp. Coefficient (dB/°C)	<0.002( Max.)
Dimensions (mm)	Bare fiber: 3.0 (Ф) x 54 ( L ) Loose tube: 3.5(Ф) x 65 ( L ) PVC: 95(L) x 12(W) x 10(H)
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	A Grade	B Grade
50 : 50	3.6	3.9
40 : 60	4.7/2.7	5.0/2.9
30 : 70	6.0/1.9	6.4/2.1
20 : 80	7.9/1.2	8.5/1.4
10 : 90	11.3/0.6	12.7/0.8
5 : 95	15.2/0.4	18.9/0.5
1 : 99	23.5/0.3	24.0/0.4
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Dual-window Star & Tree Coupler

Single mode, Star and tree Wideband+/-40nm
Parameter		1x4	4x4	1x8	8x8	1x16	16x16	1x32
Operating Wavelength(nm)		1310 &1550 (+/-40)
Coupling ratio (%)		Average
Max. Insertion loss (dB)		7.2	7.4	10.7	10.9	14.5	14.7	17.5
Uniformity (dB)		≤1.0	≤1.2	≤1.6	≤1.8	≤2.4	≤2.6	≤2.8
Directivity (dB)		>55
Operation temp.(°C)		-40 to +70 *
Storage temp.(°C)		-50 to +85
Temp. Coefficient (dB/°C)		<0.003		<0.004		<0.006
Dimension (mm)	ABS box	100(L)x80(W)x10(H)		140(L)x90(W)x10.7(H)
	Metal box	LGX Module 19" 1U Chassis		LGX Module 19" 1U Chassis		LGX Module 19" 1U Chassis 19" 2U Chassis
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Dual-window Miniature Coupler

1x2, 2x2, Miniature Size Wideband+/-40nm
Parameters	P Grade	A Grade
Operating Wavelength(nm)	1310 &1550(+/-40)
Uniformity (dB)	≤ 0.6	≤ 0.8
Coupling Ration (%)	1 : 99 to 50 : 50
Polarization Stability (dB)	0.15	0.15
Directivity (dB)	>55
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-40 to +85
Temp. Coefficient (dB/°C)	<0.002( Max.)
Dimensions (mm)	Bare fiber: 3.0 (Ф) x 35 ( L ) Loose tube: 3.5(Ф) x 42 ( L )
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	P Grade	A Grade
50 : 50	3.4	3.6
40 : 60	4.4 / 2.5	4.7 / 2.7
30 : 70	5.6 / 1.8	6.0 / 1.9
20 : 80	7.5 / 1.2	7.9 / 1.2
10 : 90	10.8 / 0.6	11.3 / 0.6
5 : 95	14.6 / 0.4	15.2 / 0.4
1 : 99	21.5 / 0.2	23.5 / 0.3
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Dual-window Low WDL Coupler

1x2, 2x2, Low WDL Coupler, Wideband+/-40nm
Parameters	P Grade		A Grade
Operating Wavelength(nm)	1310 or 1550 (+/-40)
Coupling Ration (%)	1 : 99 to 50 : 50
Polarization Stability (dB)	0.12		0.15
Directivity (dB)	>55
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-40 to +85
Temp. Coefficient (dB/°C)	<0.002( Max.)
Dimensions (mm)	Bare fiber: 3.0 (Ф) x 54 ( L ) Loose tube: 3.5(Ф) x 65 ( L ) PVC: 95(L) x 12(W) x 10(H)
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	P Grade		A Grade
	I.L	WDL	I.L	WDL
50:50	3.4	0.2	3.6	0.3
40 : 60	4.4 / 2.5	0.2	4.7 / 2.7	0.3
30 : 70	5.6 / 1.8	0.25	6.0 / 1.9	0.3
20:80	7.5 / 1.1	0.25	7.9 / 1.2	0.35
10:90	11.0 / 0.6	0.3	11.3 / 0.6	0.35
5:95	14.6 / 0.4	0.35	15.2 / 0.4	0.4
1:99	21.5 / 0.2	0.4	23.5 / 0.3	0.5
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Single-window Coupler

1x2, 2x2, Single mode, Single window Wideband+/-40nm
Parameters	A Grade	B Grade
Operating Wavelength(nm)	1310 or1550 (+/-40)
Excess loss (dB)	0.2	0.2
Uniformity (dB)	≤ 0.6	≤ 1.0
Coupling Ration (%)	1 : 99 to 50 : 50
Polarization Stability (dB)	0.10	0.15
Directivity (dB)	>55
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-50 to +85
Temp. Coefficient (dB/°C)	<0.002( Max.)
Dimensions (mm)	Bare fiber: 3.0 (Ф) x 54 ( L ) Loose tube: 3.5(Ф) x 65 ( L ) PVC: 95(L) x 12(W) x 10(H)
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	A Grade	B Grade
50 : 50	3.4	3.7
40 : 60	4.4 / 2.5	4.8 / 2.8
30 : 70	5.6 / 1.8	6.1 / 2.0
20 : 80	7.5 / 1.2	8.0 / 1.3
10 : 90	10.8 / 0.6	11.8 / 0.8
5 : 95	14.6 / 0.4	18.5 / 0.5
1 : 99	21.5 / 0.2	22.0 / 0.3
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Single-window Narrow Band Coupler

1x2, 2x2, Single mode, Single window Narrowband+/-10nm
Parameters	A Grade	B Grade
Operating Wavelength(nm)	980, 1310, 1480 or 1550
Excess loss (dB)	0.1	0.1
Uniformity (dB)	≤ 0.6	≤ 0.9
Coupling Ration (%)	1 : 99 to 50 : 50
Polarization Stability (dB)	0.10	0.15
Directivity (dB)	> 55
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-50 to +85
Temp. Coefficient (dB/°C)	< 0.002( Max.)
Dimensions (mm)	Bare fiber : 3.0 (Ф) x 54 ( L ) Loose tube : 3.5(Ф) x 65 ( L ) PVC : 95(L) x 12(W) x 10(H)
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	A Grade	B Grade
50 : 50	3.4	3.6
40 : 60	4.4 / 2.5	4.8 / 2.8
30 : 70	5.6 / 1.8	6.1 / 2.0
20 : 80	7.5 / 1.2	8.0 / 1.3
10 : 90	10.8 / 0.6	12.0 / 0.8
5 : 95	14.6 / 0.4	15.5 / 0.6
1 : 99	21.5 / 0.2	22.0 / 0.3
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Single-window Star & Tree Coupler

Single mode, Single-Window, Star and tree, Wideband+/-40nm

Parameter

1x4

4x4

1x8

8x8

1x16

16x16

1x32

Operating Wavelength(nm)

1310 or1550 (+/-40)

Coupling ratio (%)

Average

Max. Insertion loss (dB)

7.0

7.2

10.5

10.7

14.3

14.5

17.3

Uniformity (dB)

≤0.8

≤1.0

≤1.2

≤1.4

≤2.4

≤2.6

Directivity (dB)

>55

Operation temp.(°C)

-40 to +70 *

Storage temp.(°C)

-40 to +85

Temp. Coefficient (dB/°C)

< 0.003

< 0.004

< 0.006

Dimensions(mm)

ABS box

100(L)x80(W)x10(H)

140(L)x90(W)x10.7(H)

Metal box

LGX Module
19" 1U Box

LGX Module
19" 1U Box
19" 2U Box

* Bare fiber: -40 to +70, other package: 0 to +70
** The specifications listed above do not include the effect of connector loss.
** Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available.
** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Single-window Ultra Low PDL Coupler

1x2, 2x2, Low PDL Coupler, Wideband+/-40nm
Parameters	P Grade	A Grade
Operating Wavelength(nm)	1310 or 1550 ±40)
Uniformity (dB)	≤ 0.5	≤ 0.6
Coupling Ration (%)	1 : 99 to 50 : 50
Polarization Stability (dB)	≤ 0.05
Directivity (dB)	> 55
Operation temp.(°C)	-40 to +70 *
Storage temp.(°C)	-40 to +85
Temp. Coefficient (dB/°C)	< 0.002( Max.)
Dimensions (mm)	Bare fiber : 3.0 (Ф) x 54 ( L ) Loose tube : 3.5(Ф) x 65 ( L ) PVC : 95(L) x 12(W) x 10(H)
Coupling Ratio / Insertion Loss Reference Table
Desired Splitting Ratio	P Grade	A Grade
50 : 50	3.3	3.4
40 : 60	4.3/2.5	4.4/2.5
30 : 70	5.5/1.7	5.6/1.8
20 : 80	7.4/1.1	7.5/1.2
10 : 90	10.7/0.6	11.0/0.6
5 : 95	14.0/0.4	14.6/0.4
1 : 99	21.0/0.2	21.5/0.2
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Connector Type: SC,FC,ST,SC/APC,FC/APC,LC,MU are available. ** Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Single-window 1x3 & 1x4 Tube Coupler

1x3, 1x4, Single mode, Single window Wideband+/-40nm
Parameter	1x3 Premium	1x3 A Grade	1x4 Premium	1x4 A Grade
Operating Wavelength(nm)	1310 or 1550 (+/-40)
Coupling Ratio (%)	Average
Max. Insertion loss (dB)	≤ 5.4	≤ 5.8	≤ 7.0	≤ 7.4
Uniformity (dB)	≤ 0.8	≤ 1.2	≤ 1.0	≤ 1.4
1x3, 1x4, Single mode, Dual-window Wideband+/-40nm
Parameter	1x3 Premium	1x3 A Grade	1x4 Premium	1x4 A Grade
Operating Wavelength(nm)	1310 and 1550 (+/-40)
Coupling Ratio (%)	Average
Insertion loss (dB)	≤ 5.6	≤ 6.0	≤ 7.2	≤ 7.6
Uniformity (dB)	≤ 1.0	≤ 1.4	≤ 1.2	≤ 1.6
Directivity (dB)	>50
Operating Temp.(°C)	-40 to +70 *
Storage Temp.(°C)	-40 to +85
Temp. Coefficient(dB/°C)	<0.003
Dimensions (mm)	3.5(Ф) x 80(L)		4.5(Ф) x 90(L)
* Bare fiber: -40 to +70, other package: 0 to +70 The specifications listed above do not include the effect of connector loss. Specification values for devices with unbalanced split ratios are available upon request.

Single Mode Single-window 1x3 & 1x4 Narrow Band Tube Coupler

1x3, 1x4, Single mode, Single window Narrowand+/-15nm
Parameter	1x3 Premium	1x3 A Grade	1x4 Premium	1x4 A Grade
Operating Wavelength(nm)	1310 or 1550 (+/-15)
Coupling Ratio (%)	Average
Max. Insertion loss (dB)	≤ 5.3	≤ 5.5	≤ 6.8	≤ 7.2
Uniformity (dB)	≤ 0.6	≤ 0.8	≤ 0.8	≤ 1.2
Directivity (dB)	>55
Operating Temp.(°C)	-40 to +70 *
Storage Temp.(°C)	-40 to +85
Fiber Type	250um bare fiber
Dimensions (mm)	3.0(Ф)x 54(L)		3.0(Ф) x 54(L)
** The specifications listed above do not include the effect of connector loss.

Monolithic Single-mode 1x3 and 1x4 Coupler; Triple Windows (1310/1490/1550)

1x3, 1x4, Single mode, Triple window
Parameter	1x3 Premium	1x3 A Grade	1x4 Premium	1x4 A Grade
Operating Wavelength(nm)	1310,1490 and 1550
Coupling Ratio (%)	Average
Max. Insertion loss (dB)	≤ 5.4	≤ 5.7	≤ 7.0	≤ 7.4
Uniformity (dB)	≤ 0.8	≤ 1.2	≤ 1.0	≤ 1.4
Directivity (dB)	>55
Operating Temp.(°C)	-40 to +70 *
Storage Temp.(°C)	-40 to +85
Fiber Type	250um bare fiber
Dimensions (mm)	3.0(Ф)x 54(L)		3.0(Ф) x 54(L)
** The specifications listed above do not include the effect of connector loss.

PLC Optical Coupler
1 x 8 Ports ; 1 x 16 Ports ; 1 x 32 Ports

TYPE		1 x 8	1×16	1×32

Operating wavelength（nm )		1260-1650
Insertion Loss (dB) ^1,2	Typical	10.5	13.5	16.5
	Maximum	11.0	14.0	17.5
Loss Uniformity (dB)^1,2	Maximum	0.8	1.2	1.7
Polarization Dependent Loss (dB) ^1,2	Maximum	0.3
Wavelength Dependent Loss (dB)	Maximum	1.0
Directivity (dB)^1,3	Minimum	≥55
Return loss (dB)^1,3	Minimum	≥50
Operating Temperature (℃)		-40 to 85
Storage Temperature (℃)		-40 to 85
Optical Fiber Type		Corning SMF-28 or SMF-28e
Optical Fiber Length (M)		1.2
Dimension (mm) [Built-in Fanout module with 900um Loose Tube]		4 x 12 x 60	6 x 20 x 80
1. All measurements are made at room temperature. 2. The connector loss is excluded in the listed specifications. 3. The listed specifications are based on bare fiber measurement, connector loss is not included in the listed standard specifications.