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SPT-QSFP+-IR4  40Gb/s QSFP+ IR4 Optical Transceiver

1550nm 1G fiber optic transceiver

SPT-QSFP+-IR4

40Gb/s QSFP+ IR4 Optical Transceiver

Features

  • 4 CWDM lanes MUX/DEMUX design
  • Up to 12.5Gbps data rate per wavelength
  • QSFP+ MSA compliant
  • IEEE 802.3ba Electrical Interface
  • Up to 2km transmission
  • Optical link budget: 9.5dB
  • Operating case temperature: 0~70C
  • Maximum 3.5W operation power
  • SMF LC duplex connector
  • RoHS compliant 

Applications

  • 40G Campus Link
  • Infiniband interconnects
  • 40G Telecom connections
  • Data Center Interconnect

General Description
 This product is a transceiver module designed for 2m-2km optical communication applications. The design is reference to 40GBASE-IR4 of the IEEE P802.3ba standard. The module converts 4 inputs channels (ch) of 10Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 40Gb/s input into 4 CWDM channels signals, and converts them to 4 channel output electrical data.
 The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm as members of the CWDM wavelength grid defined in ITU-T G694.2. It contains a duplex LC connector for the optical interface and a 148-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module.
 The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP+ Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.


Functional Description

  •  This product converts the 4-channel 10Gb/s electrical input data into CWDM optical signals (light), by a driven 4-wavelength Distributed Feedback Laser (DFB) array. The light is combined by the MUX parts as a 40Gb/s data, propagating out of the transmitter module from the SMF. The receiver module accepts the 40Gb/s CWDM optical signals input, and de-multiplexes it into 4 individual 10Gb/s channels with different wavelength. Each wavelength light is collected by a discrete photo diode, and then outputted as electric data after amplified by a TIA. Figure 1 shows the functional block diagram of this product.
  •  A single +3.3V power supply is required to power up this product. Both power supply pins VccTx and VccRx are internally connected and should be applied concurrently. As per MSA specifications the module offers 7 low speed hardware control pins (including the 2-wire serial interface): ModSelL, SCL, SDA, ResetL, LPMode, ModPrsL and IntL.
  •  Module Select (ModSelL) is an input pin. When held low by the host, this product responds to 2-wire serial communication commands. The ModSelL allows the use of this product on a single 2-wire interface bus – individual ModSelL lines must be used.
  •  Serial Clock (SCL) and Serial Data (SDA) are required for the 2-wire serial bus communication interface and enable the host to access the QSFP+ memory map.
  •  The ResetL pin enables a complete reset, returning the settings to their default state, when a low level on the ResetL pin is held for longer than the minimum pulse length. During the execution of a reset the host shall disregard all status bits until it indicates a completion of the reset interrupt. The product indicates this by posting an IntL (Interrupt) signal with the Data_Not_Ready bit negated in the memory map. Note that on power up (including hot insertion) the module should post this completion of reset interrupt without requiring a reset.
  •  Low Power Mode (LPMode) pin is used to set the maximum power consumption for the product in order to protect hosts that are not capable of cooling higher power modules, should such modules be accidentally inserted.
  •  Module Present (ModPrsL) is a signal local to the host board which, in the absence of a product, is normally pulled up to the host Vcc. When the product is inserted into the connector, it completes the path to ground though a resistor on the host board and asserts the signal. ModPrsL then indicates its present by setting ModPrsL to a “Low” state.
  •  Interrupt (IntL) is an output pin. “Low” indicates a possible operational fault or a status critical to the host system. The host identifies the source of the interrupt using the 2-wire serial interface. The IntL pin is an open collector output and must be pulled to the Host Vcc voltage on the Host board.


Transceiver Block Diagra
Figure 1: 40Gb/s QSFP+ GR4 Transceiver Block Diagram

40G QSFP+ GR4 Transceiver
Pin Assignment and Pin Description
Figure 2: MSA compliant Connector
QSFP+ Transceiver MSA compliant connector

Pin Definitions

PIN

Logic

Symbol

Name/ Description

Note

1

 

GND

Ground

1

2

CML-I

Tx2n

Transmitter Inverted Data Input

 

3

CML-I

Tx2p

Transmitter Non-Inverted Data output

 

4

 

GND

Ground

1

5

CML-I

Tx4n

Transmitter Inverted Dat aInput

 

6

CML-I

Tx4p

Transmitter Non- Inverted Data output

 

7

 

GND

Ground

1

8

LVTLL-I

ModSelL

Module Select

 

9

LVTLL-I

ResetL

Module Reset

 

10

 

VccRx

+3.3V Power Supply Reciver

2

11

LVCMOS-I/O

SCL

2-Wire Serial Interface Clock

 

12

LVCMOS-I/O

SDA

2-Wire Serial Interface Data

 

13

 

GND

Ground

 

14

CML-O

Rx3p

Receiver Non-Inverted DataOutput

 

15

CML-O

Rx3n

Receiver Inverted Data Output

 

16

 

GND

Ground

1

17

CML-O

Rx1p

Receiver Non-Inverted Data Output

 

18

CML-O

Rx1n

Receiver Inverted Data Output

 

19

 

GND

Ground

1

20

 

GND

Ground

1

21

CML-O

Rx2n

Receiver Inverted Data Output

 

22

CML-O

Rx2p

Receiver Non-Inverted Data Output

 

23

 

GND

Ground

1

24

CML-O

Rx4n

Receiver Inverted Data Output

1

25

CML-O

Rx4p

Receiver Non-Inverted Data Output

 

26

 

GND

Ground

1

27

LVTTL-O

ModPrsL

Module Present

 

28

LVTTL-O

IntL

Interrupt

 

29

 

VccTx

+3.3V Power Supply transmitter

2

30

 

Vcc1

+3.3V Power Supply

2

31

LVTTL-I

LP Mode

Low Power Mode

 

32

 

GND

Ground

1

33

CML-I

Tx3p

Transmitter Non-Inverted Data Input

 

34

CML-I

Tx3n

Transmitter Inverted Data Output

 

35

 

GND

Ground

1

36

CML-I

Tx1p

Transmitter Non-Inverted Data Input

 

37

CML-I

Tx1n

Transmitter Inverted Data Output

 

38

 

GND

Ground

1

Note:
 1. GND is the symbol for signal and supply (power) common for QSFP+ modules. All are common within the QSFP+ module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal common ground plane.
 2. VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown below. Vcc Rx, Vcc1 and Vcc Tx may be internally connected within the QSFP+ transceiver module in any combination. The connector pins are each rated for a maximum current of 500mA.

Absolute Maximum Ratings
 It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter

Symbol

Min

Max

Unit

Note

Storage Temperature

Tst

-40

70

degC

 

Relative Humidity (non-condensation)

RH

0

85

%

 

Operating Case Temperature

Topc

0

70

degC

 

Operating Range

 

0.002

2

km

 

Supply Voltage

VCC

3.15

3.47

V

 

Optical Characteristics

Parameter

Symbol

Min.

Typical

Max

Unit

Notes

Wavelength Assignment

L0

1264.5

1271

1277.5

nm

 

L1

1284.5

1291

1297.5

nm

 

L2

1304.5

1311

1317.5

nm

 

L3

1324.5

1331

1337.5

nm

 

Transmitter

Side-mode Suppression Ratio

SMSR

30

-

-

dB

 

Total Average Launch Power

PT

-

-

8.3

dBm

 

Optical Modulation Amplitude,  each Lane

OMA

-2

-

+3.5

dBm

 

Differencein Launch Power between any two Lanes(OMA)

 

-

-

5

dB

 

ExtinctionRatio

ER

3.5

-

-

dB

 

Relative IntensityNoise

Rin

-

-

-128

dB/Hz

12dBreflection

-20dB Spectral Width

 

-

-

1

nm

Modulated

Transmitter Reflectance

RT

 

 

-12

dB

 

Total Jitter

 

 

 

0.2

UI

 

Transmitter Output Power Monitoring Accuracy

OPMA

-2

 

2

dB

 

Receiver

Damage Threshold

THd

3.5

 

 

dBm

1

Receiver Sensitivity, each Lane

SR

-

-

-11.5

dBm

 

RSSI Accuracy

 

-2

 

2

dB

 

Difference in Receive Power between any two Lanes (OMA)

 

 

 

7.5

dB

 

Receive Electrical 3dB upper Cutoff Frequency, each Lane

 

 

 

12.3

GHz

 

 Notes:
 The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. The receiver does not have to operate correctly at this input power.
 
 Electrical Characteristics
 The following electrical characteristics are defined over the Recommended Operating temperature and supply voltage unless otherwise specified.

Parameter

Symbol

Min.

Typical

Max

Unit

Notes

Supply Voltage

Vccl, VccTx, VccRx

-0.5

-

3.6

V

 

Data Rate,each Lane

 

-

10.3125

11.2

Gbps

 

Transmitter

Differential Input Impendance

 

85

100

115

ohm

 

Differential Input Swing

 

150

 

1200

mV

 

Differential Return Loss

Compliant to IEEE802.3ba

dB

 

Receiver

Differential Output Impedance

 

85

100

115

ohm

 

Differential Output Swing

 

370

 

950

mV

 

Receiver J9 Jitter

 

 

 

0.65

UI

 

Receiver electrical mask

Compliant to IEEE802.3ba

 

 

Output differential return Loss

Compliant to IEEE802.3ba

dB

 

Mechanical Dimensions
 ESD

 This transceiver is specified as ESD threshold 1kV for all electrical input pins, tested per MIL-STD-883, Method 3015.4 /JESD22-A114-A (HBM). However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.
 
 Laser Safety
 This is a Class 1 Laser Product according to IEC 60825-1:1993:+A1:1997+A2:2001. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (July 24, 2007)