Quick Spec:

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Part Number: QSFP28-100GBase-PSM4 QSFP28-100GBase-PSM4-EXT QSFP28-100GBase-PSM4-IND


Form Factor: QSFP28

TX Wavelength: 1310nm

Reach: 2km

Cable Type: SMF

Rate Category: 100GBase

Interface Type: PSM4

DDM: Yes

Connector Type: MPO Optical Power Budget: 11 dB

TX Power Min/Max: +2.0 to +4.5 dBm RX Power Min/Max: -9.0 to +4.5 dBm


Features:


Overview

The QSFP28-100GBASE-PSM4 is a parallel 100 Gbps single mode optical transceiver designed for optical communication applications. This product provides increased port density, offering four independent transmit and receive channels. Each channel operates at 25Gbps, resulting in an aggregate data rate of 100Gbps on 2km of single mode fiber. An optical fiber ribbon cable with an MTP/MPO connector can be plugged into the QSFP28 module receptacle. The guide pins inside the receptacle ensure proper alignment. The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi- Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. The module can be managed through the I2C two-wire serial interface. The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. The module can be managed through the I2C two-wire serial interface.


Functional Diagram

This product is a QSFP28 parallel single mode optical transceiver with an MTP/MPO fiber ribbon connector. The transmitter module accepts electrical input signals compatible with Common Mode Logic (CML) levels. All input data signals are differential and internally terminated. The receiver module converts parallel optical input signals via a photo detector array into parallel electrical output signals. The receiver module outputs electrical signals are also voltage compatible with Common Mode Logic (CML) levels. All data signals are differential and support a data rates up to 25Gb/s per channel. Figure 1 shows the functional block diagram of this product.



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Figure 1. Functional diagram


A single +3.3V power supply is required to power up the module. Both power supply pins VccTx and VccRx are internally connected and should be applied concurrently. Per MSA the module offers 7 low speed hardware control pins (including the 2-wire serial interface): ModSelL, SCL, SDA, ResetL, LPMode, ModPrsLand IntL. Module Select (ModSelL) is an input pin. When held low by the host, the module responds to 2-wire serial communication commands. The ModSelL allows the use of multiple QSFP28 modules on a single 2-wire interfacebus –individual ModSelL lines for each QSFP28 module 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 QSFP28 memory map. The ResetL pin enables a complete module reset, returning module 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 the module indicates a completion of the reset interrupt. The module 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 are set. Low Power Mode (LPMode) pin is used to set the maximum power consumption for the module 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 module, is normally pulled up to the host Vcc. When a module is inserted into the connector, it completes the path to ground through a resistor on the host board and asserts the signal. ModPrsL then indicates a module is present by setting ModPrsLto a“Low” state. Interrupt (IntL) is an output pin. Low indicates a possible module 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. This transceiver is specified as ESD threshold 1KV for high speed data pins and 2KV for all others 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. This is a Class 1 Laser Product according to IEC 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50.


Specifications

Absolute Maximum Ratings


Parameter

Symbol

Min

Max

Unit

Storage Temperature

Ts

-40

+85

°C

Operating Case Temp (Standard)

TOP

0

70

°C

Operating Case Temp (Industrial)

TOP

-40

85

°C

Power Supply Voltage

Vcc

-0.5

3.6

V

Relative Humidity (non- condensation)

RH

5

85

%

Damage threshold, each lane

THd

4.5


dBm


Recommended Operating Conditions


Parameter

Symbol

Min

Typ

Max

Unit

Power Supply Voltage

Vcc

3.135

3.3

3.465

V

Data Rate, each Lane



25.78125


Gb/s

Control Input Voltage High)


2


Vcc

V

Control Input Voltage Low


0


0.8

V

Link Distance (SM fiber)

D

0.002


2

km

Recommended Power Supply Filter


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Electrical Characteristics


Parameter

Symbol

Min

Typ

Max

Unit

Power Consumption


-


3.5

W

Supply Current

Icc



1.1

A

Transceiver power-on initialization time (note1)




2000

ms

Electrical Characteristics-Transmitter (each lane)


Parameter

Symbol

Min

Typ

Max

Unit

Single-ended input voltage tolerance (note 2)


-0.3


4.0

V

AC common mode input voltage tolerance


15



mV

Differential input voltage swing threshold


50



mVpp

Differential input voltage swing

Vin.pp

190


700

mVpp

Differential input impedance

Zin

90

100

110

Ω

Electrical Characteristics-Receiver


Parameter

Symbol

Min

Typ

Max

Unit

Single-ended output voltage


-0.3


4.0

V

AC common mode output voltage




7.5

mV

Differential output voltage swing

Vout.pp

300


850

mVpp

Differential output impedance

Zout

90

100

110

ohm

Notes:

  1. Power-on Initialization Time is the time from when the power supply voltages reach and remain above the minimum recommended operating supply voltages to the time when the module is fully functional.

  2. The single ended input voltage tolerance is the allowable range of the instantaneous input signals.


Optical Characteristics-Transmitter


Parameter

Symbol

Min

Typ

Max

Unit

Center wavelength

λc

1260

1310

1355

nm

Side Mode Suppression Ratio

SMSR

30



dB

Total average launch power

PT



9.5

dBm

Average launch power, each lane

PAVG

1.0


3.5

dBm

Optical Modulation Amplitude(OMA), each lane (Note )

POMA

2.0


4.5

dBm

Difference in launch power between any two lanes

Ptx,diff



5

dB

Launch power in OMA minus Transmitter and Dispersion Penalty (TDP), each Lane


1.0



dBm

TDP, each lane

TDP



3.2

dB

Extinction Ratio

ER

3.5



dB

Relative Intensity Noise

RIN



-128

dB/Hz

Optical return loss Tolerance

TOL



12

dB

Transmitter reflectance

RT



-12

dB

Average Launch Power OFF Transmitter, each Lane

Poff



-30

dBm

Transmitter Eye Mask Definition

{X1, X2, X3, Y1, Y2, Y3}


{0.25, 0.4,

0.45,

0.25,

0.28, 0.4}



Note: Even if the TDP < 1 dB, the OMA min must exceed the minimum value specified here.


Optical Characteristics-Receiver


Parameter

Symbol

Min

Typ

Max

Unit

Center wavelength

λc

1260

1310

1355

nm

Damage threshold, each lane (note )

THd

4.5



dB

Average receive power, each lane


-9.0


3.5

dBm

Receiver reflectance

RR



-12

dBm

Receiver power (OMA), each lane




4.5

dBm

Receiver sensitivity (OMA), each lane

SEN



-9.0

dB

Difference in receive power between any two lanes (OMA)

Prx,diff



5.5

dBm

LOS Assert

LOSA


-18


dB

LOS Deassert

LOSD


-15


dB

LOS Hysteresis

LOSH

0.5



dB/Hz

Receiver Electrical 3dB upper Cutoff Frequency, each Lane

Fc



31

dB

Note: 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.


Digital Diagnostic Functions

The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

Parameter

Symbol

Min

Typ

Max

Unit

Notes

Temperature monitor absolute error

DMITEMP

-3


3

deg. C

Over operating temperature range

Supply voltage monitor absolute error

DMIVCC

-0.1


0.1

V

Over Full operating range

Channel RX power monitor absolute error

DMIRX_CH

-2


2

dB

1

Channel Bias current monitor

DMIIbias_CH

-10%


10%

mA


Channel TX power monitor absolute error

DMITX_CH

-2


2

dB

1


PIN Assignment and Function Definitions



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PIN Definition


PIN

Signal Name

Description

1

GND

Ground (1)

2

Tx2n

CML-I Transmitter 2 Inverted Data Input

3

Tx2p

CML-I Transmitter 2 Non-Inverted Data Input

4

GND

Ground (1)

5

Tx4n

CML-I Transmitter 4 Inverted Data Input

6

Tx4p

CML-I Transmitter 4 Non-Inverted Data Input

7

GND

Ground (1)

8

ModSelL

LVTLL-I Module Select

9

ResetL

LVTLL-I Module Reset

10

VCCRx

+3.3V Power Supply Receiver (2)

11

SCL

LVCMOS-I/O 2-Wire Serial Interface Clock

12

SDA

LVCMOS-I/O 2-Wire Serial Interface Data

13

GND

Ground (1)

14

Rx3p

CML-O Receiver 3 Non-Inverted Data Output

15

Rx3n

CML-O Receiver 3 Inverted Data Output

16

GND

Ground (1)

17

Rx1p

CML-O Receiver 1 Non-Inverted Data Output

18

Rx1n

CML-O Receiver 1 Inverted Data Output

19

GND

Ground (1)

20

GND

Ground (1)

21

Rx2n

CML-O Receiver 2 Inverted Data Output

22

Rx2p

CML-O Receiver 2 Non-Inverted Data Output

23

GND

Ground (1)

24

Rx4n

CML-O Receiver 4 Inverted Data Output

25

Rx4p

CML-O Receiver 4 Non-Inverted Data Output

26

GND

Ground (1)

27

ModPrsL

Module Present

28

IntL

Interrupt

29

VCCTx

+3.3V Power Supply Transmitter (2)

30

VCC1

+3.3V Power Supply

31

LPMode

LVTLL-I Low Power Mode

32

GND

Ground (1)

33

Tx3p

CML-I Transmitter 3 Non-Inverted Data Input

34

Tx3n

CML-I Transmitter 3 Inverted Data Input

35

GND

Ground (1)

36

Tx1p

CML-I Transmitter 1 Non-Inverted Data Input

37

Tx1n

CML-I Transmitter 1 Inverted Data Input

38

GND

Ground (1)


Notes:

  1. All Ground (GND) are common within the QSFP+ module and all module voltages are referenced to this potential unless noted otherwise. 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. The connector pins are each rated for a maximum current of 500mA.


Licensing

The following U.S. patents are licensed by Finisar to FluxLight, Inc.:

U.S. Patent Nos: 7,184,668, 7,079,775, 6,957,021, 7,058,310, 6,952,531, 7,162,160, 7,050,720