IC212 [ICHAUS]
HIGHSPEED PHOTORECEIVER; HIGHSPEED光接收机
| 型号： | IC212 |
| 厂家： | 
IC-HAUS GMBH |
| 描述： | HIGHSPEED PHOTORECEIVER |
| 文件： | 总15页 (文件大小：7636K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 1/15
FEATURES
APPLICATIONS
♦ Fast pulse and transient
measurement
♦ Optical triggering
♦ Optical front-end for
oscilloscopes
♦ Bandwidth DC to 1.4 GHz
♦ Si PIN photodiode, Ø 0.4 mm active area diameter
♦ Spectral response range λ = 320 to 1000 nm
♦ Amplifier transimpedance (gain) 3.125 V/mA
♦ Max. conversion gain 1.625 V/mW @ 760 nm
BLOCK DIAGRAM
Copyright © 2010 iC-Haus
http://www.ichaus.com
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 2/15
DESCRIPTION
The iC-Haus Highspeed Photoreceiver iC212 has Ø 0.4 mm, which is increased by an Ø 1.5 mm ball
been developed for optical high speed measurement. lens, resulting in an effective usable area of typical
With its bandwidth ranging from DC up to 1.4 GHz 0.75 mm². The Highspeed Photoreceiver is able to
it detects photo signals from constant light to high detect optical power levels in the sub mW range at
speed with rise times down to 280 ps. The iC212 GHz speed.
Highspeed Photoreceiver also features offset adjust-
ment to compensate DC levels of the input signal.
The iC212 Highspeed Photoreceiver comes with M6
mounting holes for integration in optical bench sys-
The photodiode used offers a spectral range from tems and an optional fiber-optic input adapter for op-
320 to 1000 nm with an active area diameter of about tical fiber coupling.
ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed.
Item Symbol
No.
Parameter
Conditions
Unit
Min.
Max.
10
G001 Pmax
G002 Vs
Optical Input Power
mW
V
Power Supply Voltage
±20
ELECTRICAL CHARACTERISTICS
Test Conditions: Vs = ±15 V, Ta = 25 °C, System Impedace 50 Ω
Item Symbol
No.
Parameter
Conditions
Unit
Min.
Typ.
Max.
Gain
101
A
Amplifier Transimpedance
Conversion Gain
50 Ω load
λ = 760 nm
3.125
1.625
V/mA
V/mW
Frequency Response
201 fmax
202 ∆A
203 tr
Upper Cut-Off Frequency
-3 dB
1.4
±1
Ghz
dB
ps
Gain Flatness
Rise Time
10 to 90%
280
750
204 tpd
Propagation Delay
optical in => electrical out, 50% to 50%
ps
Detector (Si PIN photodiode)
301
d
Active Area Diameter
Effective Active Area
Spectral Range
ball lens Ø 1.5 mm
0.4
mm
mm²
nm
302 Aeff
ball lens Ø 1.5 mm, note tolerances from Fig. 3
0.75
303
304
λ
320
1000
Pmax
Max. Optical Input Power
average
linear amplification @ 760 nm
10
615
mW
µW
305 NEP
Noise equivalent power
including amplifier noise, at λ=760nm and f =
1 GHz; (for frequency dependence see Fig. ??)
115
pW/
Hz
√
Output
401 Rout
402 Vout
403 Vos
404 Pos
405 twu
Power Supply
501 Vs
Output Impedance
50
Ω
V
Output Voltage Swing
Offset Voltage (adjustable)∗
Offset (adjustable)∗
Warm-Up Time
50 Ω load, for linear amplification
DC offset cancellation
-0.3
-1.25
-92
1.0
0.15
750
V
equivalent optical power
stable offset voltage
µW
min
30
Supply Voltage
Supply Current
±15
V
502 Is
±150
mA
∗ The output is clipped to -0.5 V, if the offset voltage is less than 0.5 V and no DC light is present.
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 3/15
CONTENTS
The purchased parts package includes
• Coaxial cable with SMA plugs
• SMA to BNC adapter
• Fiber adapter
• Highspeed Photoreceiver iC212
• Power adapter (230 VAC)
Figure 1: Box contents
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 4/15
DIMENSIONS
Figure 2: Case dimensions (all units in mm)
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 5/15
CONNECTORS
Input
Optical, with microbench adapter
(Ø 25 mm) and SMA fiber adaption
Output
SMA Connector
Power Supply Hirose series HR10-7R-6P, 6-Pin
Pin 1, 2: +Vs
Pin 3, 6: GND
Pin 4, 5: -Vs
Table 1: Connectors
PHOTODIODE WITH BALL LENS
Figure 3: Photodiode with ball lens (lens type borosilicate glass)
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 6/15
RESPONSE
Figure 4: Spectral response
Figure 5: Pulse response
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 7/15
APPLICATION NOTES
These application notes are meant to demonstrate
some typical measurement tasks, carried out with the
iC212 and verified with a standard optical power meter.
Mesurement of total optical output power Popt
1. Put laser in pulse mode
2. Adjust lens, for maximum amplitude at the output
of iC212 (Fig. 6)
3. Read amplitude: U = 0.803 V (Fig. 7)
Calculation: λ = 635 nm, spectral response taken
from Figure 4: S(@635 nm) = 1.34 V/mW
U
S
0.803 V
Popt (iC212) =
=
= 0.60 mW
V
1.34mW
Figure 7: Oscilloscope reading
4. Put laser in CW mode
5. Put Newport sensor into laser beam and read the
power: Popt(Newport) = 0.641 mW (Fig. 8)
The results match within 7%.
Figure 8: Total optical output power with 1 cm² sen-
sor (Newport)
Figure 6: The laser light focused with a collecting
lens onto the sensor
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 8/15
Measurment of Irradiance E
6. With a sensor area of 100 mm² this results in
E(Newport) = 0.0644 mW/mm²
1. Put laser in CW mode
2. Homogenisation of laser light with microlens ar-
rays (Fig. 10)
The results match within 10%.
3. Put iC212 into the center of the homogenised
laser light (Fig. 11)
4. Read oscilloscope: U = 76 mV (Fig. 12)
Calculation: λ = 659 nm, spectral response taken
from Figure 4: S(@659 nm) = 1.42 V/mW, effec-
tive area (Item No. 302: Aeff = 0.75 mm²)
U
E(iC212) =
S ∗ Aeff
0.076 V
1.42mW ∗ 0.75 mm2
mW
mm2
=
= 0.071
V
Figure 11: iC212 in the center of the homogenised
laser light
Figure 9: Laser 659 nm, 150 mW with two mi-
crolens arrays for homogenisation
Figure 12: Oscilloscope reading
Figure 10: Homogeneously illuminated area of ca.
4 cm x 4 cm
5. Put Newport sensor into laser beam and read the
power: Popt(Newport) = 6.441 mW (Fig. 13)
Figure 13: Newport sensor in the center of the ho-
mogenised laser light
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 9/15
Measuring time of flight
Figure 14: Laser, pole filter, beam expander, beam
splitter and two iC212
Figure 16: One iC212 positioned 30 cm closer to
the beam splitter
Figure 15: No propagation time difference at same
distance from beam splitter
Figure 17: 30 cm distance difference means 1 ns
propagation time difference
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 10/15
Fiber-optic input
Figure 18: Laser, SMA fiber collimator, fiber, iC212
fiber adapter, iC212
Figure 20: SMA fiber collimator
Figure 19: iC212 fiber adapter
Figure 21: Fiber transmitted light pulse
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 11/15
Noise Equivalent Power (NEP)
NEP(λ)
= INV(f) * 1/S(λ)
NEP specifies the lowest light power (Pmin) that can
be detected by the sensor. In that case the signal to
noise ratio (S/N) would be 1, which means the signal
to be measured is of the same magnitude as the noise.
NEP(λ = 473 nm) = INV(93 MHz) / S(λ = 473 nm)
NEP(λ = 473 nm) = 215 nV/ Hz * 1 mW / 0.67 V
√
√
= 320 pW/ Hz
√
Noise(BW)
= NEP(λ = 473 nm) * BW
√
√
Noise(93 MHz) = 320 pW/ Hz * 93 MHz
= 3.09 µWRMS
√
Smax
S(λ)
Pmin(λ) =
∗ NEP ∗ BW
As to be expected this value is slightly higher than in
the first estimation.
Pmin(λ) - minimum detectable power, which can be
distinguished from noise (only white noise,
1/f-noise ignored)
Mesurement of minimum optical power Pmin(λ)
S(λ) - photo sensitivity at wavelength λ
Smax - maximum photo sensitivity
NEP - NEP at maximum photo sensitivity
1. Homogenisation of the blue LED light with mi-
crolens arrays (Figure 23)
2. LED modulation with 1 MHz
BW
- bandwidth
3. Change distance between iC212 and LED un-
til signal is barely distinguishable from noise
(method imprecise but rather simple to get a ba-
sic estimation)
4. Put Newport sensor at same distance as iC212
into the LED beam and read the power: PM =
126 µW (Figure 25)
Example
Blue LED with λ = 473 nm, square wave modulated f =
1 MHz (T = 1 µs), bandwidth of measuring circuit BW =
93 MHz.
Smax
NEP
= 1.625 V/mW (Figure 4)
= 115 pW/ Hz (Item No. 305)
√
S(λ = 473 nm) = 0.67 V/mW (Figure 4)
Because of the duty cycle (50%), the measured power
has to be multiplied by 2. The Newport sensor is com-
pletely illuminated (100 mm²). Hence the irradiance
can be calculated to
√
93 MHz
1.625
0.67
pW
√
Pmin(λ = 473 nm) =
∗ 115
∗
Hz
= 2.7 µWRMS
126 µW
100 mm2
µW
mm2
E(Newport) = 2 ∗
= 2.52
This calculation is only valid, if the input noise is fre-
quency independent. Figure 22 shows the input noise
(INV = Input Noise Voltage) of the photo amplifier.
With the effective area of the iC212 sensor (Item No.
302, Aeff = 0.75 mm²) this yield a total power of
µW
mm2
Pmin(λ = 473, measured) = 2.52
∗ 0.75 mm2
= 1.9 µW
This matches the calculated value reasonably well.
Output noise without signal:
√
Noise(BW) = INV(f) ∗ BW
√
nV
Figure 22: Input Noise Voltage as a function of the
frequency - with lower frequencies there
is higher noise
√
Noise(93 MHz) = 215
∗
93 MHz
Hz
= 2.07 mVRMS
For frequencies around 93 MHz an input noise of A slightly higher value of µ = 3 mVRMS has been mea-
√
215 nV/ Hz can be estimated.
sured though.
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 12/15
Figure 25: Homogeniously illuminated Newport
sensor
Figure 23: Homogenised blue LED light
Figure 26: Noise
Figure 27: Noise with signal barely detectable
Figure 24: Homogeniously illuminated iC212
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 13/15
Ulbricht sphere
Figure 28: 3-port Ulbricht sphere with iC212 and
Newport power meter
Figure 30: Laser light coupled into the Ulbricht
sphere
Figure 31: Laser pulse with 260 ps rise time (chan-
nel 1)
Figure 29: HG1M laser controller with 2 W CW
laser diode
On the ideal size of an Ulbricht sphere see also "How
to select an integrating sphere for your application" by
Valerie C. Coffey at www.optoiq.com.
Figure 32: Due to size of Ulbricht sphere the pulse
gets distorted (ca. 4 ns rise time)
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 14/15
Equipment used
Mesuring instruments
Accessories
iC-Haus: iC149, 8-Bit pulse generator ,1 to 64 ns,
compatibel to LDMxxx series lasers by Omi-
cron
Tektronix:
TDS7404B, 4 GHz, 20 GS/s,
4-Channel Digital Phosphor Oscillo-
scope
iC-Haus: iC213, 12-Bit Oszillator, 40 kHz to 500 MHz,
compatibel to LDMxxx series lasers by Omi-
cron
Newport:
Newport:
Optical Power Meter Model 840
Sensor 818-ST, Sensor 818-UV,
Sensor 818-ST/CM
iC-Haus: iC215_6, pulse width modulator,
640 ps to 10.23 ns, compatibel to LDMxxx
series lasers by Omicron and iC213
iC-Haus: HG1M, control module for high speed, high
power laser diodes
Newport:
819D-SL-3.3, 3-Port 3.3" Spectralon
Ulbricht Sphere
Ocean Optics: USB2000 Fiber-optic Spectrometer
320 - 1100 nm
Omicron:
Femto:
iC-Haus:
HP:
LDM639.40.500, 40 mW Laser,
fMOD > 500 MHz
HSA-X-S-1G4-SI, Ultra High Speed
Photoreceiver
iC212 Highspeed Photoreceiver,
DC to 1.4 GHz
8590L, Spectrum Analyzer
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merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which
information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or
areas of applications of the product.
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mark rights of a third party resulting from processing or handling of the product and/or any other use of the product.
As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical
applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of
use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued
annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in
Hanover (Hannover-Messe).
We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations
of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can
be put to.
iC212
HIGHSPEED PHOTORECEIVER
Rev A2, Page 15/15
ORDERING INFORMATION
Type
Package
Order Designation
iC212
iC212
For technical support, information about prices and terms of delivery please contact:
iC-Haus GmbH
Tel.: +49 (61 35) 92 92-0
Am Kuemmerling 18
D-55294 Bodenheim
GERMANY
Fax: +49 (61 35) 92 92-192
Web: http://www.ichaus.com
E-Mail: sales@ichaus.com
Appointed local distributors: http://www.ichaus.com/sales_partners
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