Datasheet > DN135

DN135

更新时间： 2024-02-17 04:19:48

品牌	Logo	应用领域
其他 - ETC		转换器光纤光电二极管光电二极管监视器
页数	文件大小	规格书
2页	317K
描述
CURRENT TO VOLTAGE CONVERTER FOR PIGTAILED PHOTODIODE FIBER OPTIC POWER MONITORS

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DN135 数据手册

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DN135

DATA SHEET

CURRENT TO VOLTAGE CONVERTER FOR PIGTAILED

PHOTODIODE FIBER OPTIC POWER MONITORS

10 9

Therm

Optics

DN135

XXXX

0.650"

The DN135 is a current to voltage converter that is intended for use in

fiber optic power monitors. The device converts current from a

photodiode to voltage that is proportional to the incoming optical power in

dBm. The DN135 functions equally well with InGaAs and Silicon

photodiodes.

0.55"

0.050"

0.100"

PIN #

FUNCTION

FEATURES

FACTORY CALIBRATION

IIN CURRENT INPUT

GROUND

• 70dB DYNAMIC RANGE

• CONVERTS CURRENT LEVELS FROM 100pA to 2mA

• 0.500 VOLTS OUTPUT PER DECADE INCREASE IN OPTICAL POWER

• OPERATES FROM ± 5 VOLTS SUPPLIES

VREF 1.25 VOLT REFERENCE

GROUND

+5 VOLTS

+5V

-5V

VC CALIBRATION INPUT

-5 VOLTS

OPTICAL

POWER IN

VO VOLTAGE OUTPUT

FACTORY CALIBRATION

Pigtailed

Photodiode

Output

DN135

3, 5

The pigtailed photodiode and DN135 assembly

is calibrated by introducing an optical signal of

known magnitude into the fiber and adjusting

the calibration potentiometer so that the output

voltage corresponds to the input power level.

1.25 Volts

Ref.

Equation relating optical power

input PIN to output voltage VO.

10KΩ

Calibration

Adjustment

PIN = 20(VO -4) dBm

Example:

6.81KΩ

One hundred microwatts of optical power

@1550nm is introduced into a fiber that is

terminated in an InGaAs photodiode.* Adjust

the calibration control shown in Figure 1 until

the output voltage indicates 3.500 Volts. The

optical power monitor is now calibrated at

1550nm.

VO = 2.750 Volts

Figure 1

PIN = 20(2.750 - 4) = -25 dBm

INPUT

POWER

OUTPUT

VOLTAGE

INPUT

OUTPUT

VOLTAGE

CURRENT

Watts

dBm

Volts

Amperes

Volts

The calibration control can be driven from an

external voltage source such as the output of a

digital to analog converter. This would allow

the power monitor to be automatically

100

µ A

µ W

-10

-20

-30

-40

-50

-60

-70

4.000

3.500

3.000

2.500

2.000

1.500

1.000

0.500

4.000

3.500

3.000

2.500

2.000

1.500

1.000

0.500

calibrated in a systems application.

100

*A typical InGaAs photodiode may have a

responsivity of 0.9mA/mWatt of optical power

at 1550nm. This would provide an output of

current of 90µA with an input power of 100µW.

The calibration control corrects for variations in

the responsivity of various photo diodes.

100

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