DATASHEET | FEBRUARY 2012 FIBER OPTICS
| REV
2012.02
Applications
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The 2651 provides the proven high performance of EMCORE’s photodiode
technology in a very practical, cost-effective package. The 2651A features high
linearity and low capacitance over a 1 GHz bandwidth. The extended bandwidth
2651E offers high linearity and low capacitance up to 3 GHz. These broadband
photodiodes are housed in a small, environmentally rugged coaxial package.
The 2651 broadband photodetector is designed to provide the performance and
flexibility needed to meet the expanding applications of two-way communications
networks. This photodiode is used today in forward-and return-path applications,
including AM-VSB CATV, QAM 64/256, PON, FTTC and FTTH receivers.
The 2651A and 2651E photodiodes are compliant with all criteria of the Restriction
of the Use of Hazardous Substances in Electrical and Electronic Equipment
(RoHS) guidelines 2002/95/EC
Performance Highlights
Min Typ Max Units
Operating Case Temperature -40 25 +85 °C
Wavelength 1100 - 1600 nm
Responsivity, 1310 nm
1550 nm
-
-
0.90
0.98
-
- A/W
Dark Current, 25°C
85°C
-
-
-
-
5
50 nA
Capacitance - 0.35 0.4 pF
Bandwidth, 2651A
2651E
-
-
-
-
1000
3000 MHz
Gain Flatness, < 1 GHz - - 1.0 dB
p-p
Gain Up-Tilt, 2651E, 1 GHz to 3 GHz 2 - 4 dB
DSO,
2651A/E,
< 1 GHz
2651A/E,
1 GHz – 3 GHz
-
-
-
-
-75
-65 dBc
DTB, 2651A/E, < 1 GHz
2651E, 1 GHz – 3 GHz
-
-
-
-
-85
-75 dBc
Bias Voltage 10 12 15 V
DATASHEET | FEBRUARY 2012
FIBER OPTICS
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2012.02
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress
ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the
operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect
device reliability.
Parameter Symbol Min Max Unit
Operating Temperature Range T
op
-40 85 °C
Storage Temperature Range T
stg
-40 85 °C
Input Power Saturation P
IN
- 10 mW
Reverse Voltage V
R
- 30 V
Forward Current I
F
- 10 mA
DC/Optical Characteristics
Parameter Condition
Min Typ Max Unit
Wavelength - 1100 - 1600 nm
Responsivity 1310 nm
1550 nm
0.85
0.95
0.90
0.98
-
- A/W
Dark Current 25°C
85°C
-
-
-
-
5
50 nA
Capacitance - - 0.35 0.4 pF
Optical Return Loss - - -40 dB
Bias Voltage - 10 12 15 V
Fiber Buffer - - 900 - µm
Fiber Core / Cladding - - 9/125 - µm
RF Characteristic
Parameter Condition
Min Typ Max Unit
Frequency Range
1
2651A
2651E
-
-
-
-
1000
3000 MHz
Frequency Response
1
2651A/E, peak-to-valley, < 1 GHz - - 1 dB
Frequency Response
1
2651E up-tilt gain
2
2 - 4 dB
DSO
1,3
2651A/E, 1310 nm, two tone test
2651E, 1310 nm, two tone test
4
-
-
-
-
-75
-65 dBc
DTB
1,3
2651A/E, 1310 nm, two tone test
2651E, 1310 nm, two tone test
4
-
-
-
-
-85
-75 dBc
1. Characterized with resistive load of 75Ω.
2. 1 GHz to 3 GHz.
3. Each test laser has 40% OMI. Distortion products are measured at 81, 449, 600, 850. Optical P
in
= 0 dBm. V
pd
= 12V.
4. Additional test frequencies of 1500, 2000, and 2500 MHz
DATASHEET | FEBRUARY 2012
FIBER OPTICS
|
REV
2012.02
Outline Drawing (Dimensions are in mm)
Block Diagram and Pinout
Pin Definitions
Pin Description
1 Anode
2 Cathode
3 Ground
.
.
.
Anode
Cathode
Ground
.
.
.
Anode
Cathode
Ground
DATASHEET | FEBRUARY 2012
FIBER OPTICS
|
REV
2012.02
Fiber Length
Plastic Mounting Bracket
(Dimensions are in mm)
115 + 15 cm
60 + 2 cm
47 + 2 cm
38 + 2 cm
Conn
115 + 15 cm
60 + 2 cm
47 + 2 cm
38 + 2 cm
Conn
With Bracket Without BracketWith Bracket Without Bracket
DATASHEET | FEBRUARY 2012
FIBER OPTICS
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2012.02
Metal Mounting Bracket
(Dimensions are in mm)
DATASHEET | FEBRUARY 2012
FIBER OPTICS
|
REV
2012.02
Ordering Information – Model Number Options
2651A-045-115-N
Model
V
ersion
2651A
2651E
Optical Connector
020 = FC/APC
023 = FC/UPC
045 = SC/APC 8O
Angle Connector
046 = SC/APC 9 O Angle connector
040 = SC/UPC
0E2 = E2000
Fiber
Le
ngth
038 = 38 cm
047 = 47cm
060 = 60 cm
066 = 66 cm
115 = 115 cm
100 = 100 cm
Mounting Bracket
N = No mounting bracket
B = Plastic mounting bracket
M = Metal mounting bracket
