CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
Preliminary DATA SHEET
CFORTH-QSFP-40G-SR4
40GBd QSFP+ SR4 Transceiver
CFORTH-QSFP-40G-SR4 Overview
CFORTH-QSFP-40G-SR4 QSFP+ SR4 optical transceiver are base on Ethernet IEEE P802.3ba standard and SFF 8436 standard.
QSFP+ SR4 offers 4 independent transmit and receive channels, each capable of 10Gbps for an aggregate bandwidth of 40Gbps.
Product Features

4 high-speed full duplex channels

Multi Rate, up to 10.5Gbps

QSFP+ MSA compliant

XLPPI electrical interface

Up to 100 meters over OM3 Multimode Fiber and 150meters over OM4 Multimode Fiber.

Low Power consumption, less than 1.5W

Reliable VCSEL array technology

Single 1X12 MPO receptacle

RoHS Compliance

Operating temperature range: 0℃ to 70℃.
Applications

40G Ethernet

Breakout to 10GBASE-SR Ethernet

Infiniband interconnects
Ordering Information
Part Number
CFORTH-QSFP-40G-SR4
Description
40G QSFP+ 850nm MPO Connectors, Up to 100m over MMF, with DOM function.
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
General Specifications
Parameter
Symbol
Min
Typ
Max
Unit
Remarks
15
Bit Error Rate
BER
Operating Temperature
TOP
0
70
℃
Case temperature
Storage Temperature
TSTO
 40
85
℃
Ambient temperature
300
350
mA
For electrical power interface
3.3
3.45
V
3.6
V
10
IS
Supply Current
Input Voltage
VCC
3.15
Maximum Voltage
VMAX
 0.5
For electrical power interface
Link Distances
Parameter
40
GBd
Fiber Type
Distance Range (m)
MMF
Up to 100
Optical Characteristics – Transmitter
Parameter
Symbol
Min
Average Launch Power(Each Lane)
PTX
Optical Center Wavelength
Max
Unit
-7.6
2.4
dBm
C
840
860
nm
Extinction Ratio
ER
3
Spectral Width (– 20 dB)

0.65
nm
Relative Intensity Noise
RIN
 128
dB/Hz
Transmitter Dispersion Penalty
TDP
3.5
dB
Transmitter Eye Mask
Launch Power of OFF
Transmitter
Typ
Remarks
dB
According to IEEE 802.3ba
POUT_OFF
– 30
dBm
Max
Unit
Average
Optical Characteristics – Receiver
Parameter
Symbol
Min
Optical Center Wavelength
C
840
860
nm
Optical Input Power, each lane
PIN
-9.5
2.4
dBm
Damage Threshold
P
3.3dBm
Receiver Power (OMA), each lane
RX
3.0
dBm
RX_SEN
-5.4
dBm
Receiver Reflectance
TRRX
– 12
dB
LOS Assert
LOSA
LOS De-Assert
LOSD
Stressed Receiver Sensitivity (OMA), each
Typ
Remarks
Average, Informative
lane
LOS Hysteresis
– 25
dBm
– 12
0.5
dBm
dB
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
Electrical Characteristics – Transmitter
Parameter
Symbol
Min
Typ
Dr
Data Rate Per Channel
Max
Unit
10.5
GB/s
VIN_PP
300
1200
mV
Transmit disable voltage
VD
VCC -1.3
VCC
V
Transmit enable voltage
VEN
VEE
VEE+0.8
V
Max
Unit
10.5
GB/s
700
mV
50
mV
3.8
V
7.5
mV
Single ended data input swing
Remarks
Non condensing
Note: The worst case electrical input is defined by the eye mask:
Electrical Characteristics – Receiver
Parameter
Symbol
Dr
Data Rate Per Channel
VOUT_PP
Differential Output Amplitude
Differential
Output
Min
Amplitude
in
340
VOUT_SQ
Typ
Remarks
Non condensing
Squelched state
Single Ended Voltage Tolerance
V
Output AC Common Mode Voltage
Vcm
Output Transition Time
Tr, Tf
-0.3
28
ps
Total Jitter
Tj
0.7
UIp-p
Deterministic Jitter
Dj
0.4
UIp-p
Eye Mask
RMS
See Note
Note:
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
Block Diagram of Transceiver
The QSFP-SR4 has miniature optical engine embeded into QSFP module. The engines interconnect 4 independent
transmit/receive lanes.
A functional block diagram of the engine is shown in the above Figure. The transmitter sections consists of 4-channel VCSEL array,
a 4-channel input buffer and laser driver
An on board micro-controller provides control, diagnostic and monitoring for the cable functions, as well as the external I2C serial
communication interface.
The Receiver section consists of a 4-channel PIN photodiode array, a 4-channel TIA array, and a 4-channel output buffer.
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
Dimensions
ALL DIMENSIONS ARE ±0.2mm UNLESS OTHERWISE SPECIFIED
UNIT: mm
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
PCB Layout Recommendation
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
Electrical Pad Layout
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CFORTH-QSFP-40G-SR4 Specifications Rev. D00C
Pin Assignment
PIN #
Symbol
Description
1
GND
Ground
2
Tx2n
Transmitter Inverted Data Input
3
Tx2p
Transmitter Non-Inverted Data Input
4
GND
Ground
5
Tx4n
Transmitter Inverted Data Input
6
Tx4p
Transmitter Non-Inverted Data Input
7
GND
Ground
8
ModSelL
Module Select
9
ResetL
Module Reset
10
Vcc RX
+3.3V Power Supply Receiver
11
SCL
2-wire serial interface clock
12
SDA
2-wire serial interface data
13
GND
Ground
14
Rx3p
Receiver Non-Inverted Data Output
15
Rx3n
Receiver Inverted Data Output
16
GND
Ground
17
Rx1p
Receiver Non-Inverted Data Output
18
Rx1n
Receiver Inverted Data Output
19
GND
Ground
20
GND
Ground
21
Rx2n
Receiver Inverted Data Output
22
Rx2p
Receiver Non-Inverted Data Output
23
GND
Ground
24
Rx4n
Receiver Inverted Data Output
25
Rx4p
Receiver Non-Inverted Data Output
26
GND
Ground
27
ModPrsL
28
IntL
29
Vcc TX
30
Vcc1
31
LPMode
32
GND
Ground
33
Tx3p
Transmitter Non-Inverted Data Input
34
Tx3n
Transmiiter Inverted Data Input
35
GND
Ground
36
Tx1p
Transmitter Non-Inverted Data Input
37
Tx1n
Transmiiter Inverted Data Input
38
GND
Ground
Remarks
Module Present
Interrupt
+3.3V Power Supply transmitter
+3.3V Power Supply
Low Power Mode
References
1. IEEE standard 802.3ba. IEEE Standard Department, 2010.
2. QSFP+ 10Gbs 4X PLUGGABLE TRANSCEIVER – SFF-8436
Page 9
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