QSFP28-100GBase-LR1 Quick Spec:

A picture containing device  Description automatically generated

Part Number: QSFP28-100GBase-LR1

QSFP28-100GBase-LR1-EXT QSFP28-100GBase-LR1-IND

Form Factor: QSFP28 TX Wavelength: 1310nm Reach: 10km

Cable Type: SMF Rate Category: 100G Interface Type: LR1 DDM: Yes

Connector Type: Dual-LC


QSFP28-100GBase-LR1 Features


Product Description

This product is a transceiver module designed for 10km optical communication applications. The module incorporates one channel optical signal, on 1310nm center wavelength, operating at 50Gbaud data rate. The transmitter path incorporates an EML Driver and a cooled EML together. On the receiver path, the input optical signal is coupled to a Pin photodiode detector. A DSP based gearbox is used to convert 4x25Gbps NRZ signals to 1x50Gbaud PAM4 signal. Also, a 4-channel retimer and FEC block are integrated in this DSP. The electrical interface is compliant with IEEE 802.3cd and QSFP28 MSA in the transmitting and receiving directions, and optical interface is compliant to IEEE 802.3cd and 100G Lambda MSA with Duplex LC connector. The module has a maximum power consumption of 4.5W.


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.

Functional Description

This product converts the 4-channel of 100Gbps aggregated NRZ electrical input data into one channel of 50Gbaud PAM4 optical signal (light) on 1310nm center wavelength through a DSP based gearbox, by a driven cooled Electro- absorption Modulated DFB Laser (EML). The light propagates out of the transmitter into an SMF fiber. The receiver module accepts the 50Gbaud PAM4 optical signal input, and converts it into a 50Gbaud PAM4 electrical signal via a linear amplifier. And then convert the 50Gbaud PAM4 signal into 4 channels of 25Gbps NRZ signals. 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 seven 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 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 through 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.


ABSOLUTE MAXIMUM RATINGS

The operation in excess of any absolute maximum ratings might cause permanent damage to this module.


Parameter

Symbol

Min

Max

Unit

Notes

Storage Temperature

TS

-40

85

degC


Operating Case Temperature - Commercial

TOP

0

70

degC


Operating Case Temperature – Extended

TOP

-5

85

degC


Operating Case Temperature - Industrial

TOP

-40

85

degC


Power Supply Voltage

VCC

-0.5

3.6

V


Relative Humidity (non-condensation)

RH

0

85

%


Damage Threshold, each Lane

THd

5.5


dBm



RECOMMENDED OPERATING CONDITIONS


Parameter

Symbo l

Min

Typical

Max

Unit

Notes

Operating Case Temperature

TOP

0


70

degC


Power Supply Voltage

VCC

3.135

3.3

3.465

V


Electrical Data Rate, each Lane (NRZ)



25.78125


Gb/s


Optical Data Rate (PAM4)



53.125


GBd


Data Rate Accuracy


-100


100

ppm


Pre-FEC Bit Error Ratio




2.4x10-4



Post-FEC Bit Error Ratio




1x10-12


1

Control Input Voltage High


2


Vcc

V


Control Input Voltage Low


0


0.8

V


Link Distance with G.652

D

0.002


10

km

2

Notes:


  1. FEC feature is embedded in the module.

  2. FEC required to be turned on to support maximum transaction distance.

    Electrical Characteristics


    Parameter

    Test Point

    Min

    Typical

    Max

    Unit

    Notes

    Power Consumption




    4.5

    W


    Supply Current

    Icc



    1.36

    A


    Transmitter (each Lane)

    Overload Differential Voltage pk-pk

    TP1a

    900



    mV


    Common Mode Voltage (Vcm)

    TP1

    -350


    2850

    mV

    1

    Differential Termination Resistance Mismatch

    TP1



    10

    %

    At 1MHz


    Differential Return Loss (SDD11)


    TP1



    See CEI- 28G- VSR

    Equation 13-19


    dB


    Common Mode to Differential conversion and Differential to Common Mode conversion

    (SDC11, SCD11)


    TP1



    See CEI- 28G- VSR

    Equation 13-20


    dB



    Stressed Input Test


    TP1a

    See CEI- 28G- VSR

    Section 13.3.11.2.

    1





    Receiver (each Lane)

    Zout

    90

    100

    110

    Ohm


    Differential Voltage, pk-pk

    TP4



    900

    mV


    Common Mode Voltage (Vcm)

    TP4

    -350


    2850

    mV

    1

    Common Mode Noise, RMS

    TP4



    17.5

    mV


    Differential Termination Resistance Mismatch

    TP4




    10


    %


    At 1MHz


    Differential Return Loss (SDD22)


    TP4



    See CEI- 28G- VSR

    Equation 13-19


    dB


    Common Mode to Differential conversion and Differential to Common Mode conversion (SDC22, SCD22)


    TP4



    See CEI- 28G- VSR

    Equation 13-21


    dB


    Common Mode Return Loss (SCC22)

    TP4




    -2


    dB


    2

    Transition Time, 20 to 80%

    TP4

    9.5



    ps


    Vertical Eye Closure (VEC)

    TP4



    5.5

    dB


    Eye Width at 10-15 probability (EW15)

    TP4


    0.57




    UI


    Eye Height at 10-15 probability (EH15)

    TP4

    228



    mV


    Notes:

    1. Vcm is generated by the host. Specification includes effects of ground offset voltage.

    2. From 250MHz to 30GHz.

Optical Characteristics


Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter

Center Wavelength

λt

1304.5


1317.5

nm


Side Mode Suppression Ratio

SMSR

30



dB


Average Launch Power

PAVG

-1.4


4.5

dBm

1

Outer Optical Modulation

Amplitude (OMAouter)


POMA


0.7



4.7


dBm


2

Launch Power in OMAouter







minus Transmitter and Dispersion Eye Closure


-0.7



dBm

for ER≥4.5dB

(TDECQ)

TDP



3.0



Launch Power in OMAouter







minus Transmitter and Dispersion Eye Closure

TOL

-0.6


20

dBm

for ER<4.5dB

(TDECQ)

RT



-12



Transmitter and Dispersion Eye Closure for PAM4 (TDECQ)


TDECQ




3.4

Extinction Ratio

ER

3.5



RIN15.6OMA

RIN



-136

Optical Return Loss Tolerance

TOL



15.6

Transmitter Reflectance

RT



-26

Average Launch Power OFF Transmitter


Poff




-15

Receiver

Center Wavelength

λr

1304.5


1317.5

nm


Damage Threshold

THd

5.5



dBm

3

Average Receive Power


-7.7


4.5

dBm



Receive Power (OMAouter)





-6.1


dBm

for BER=

2.4x10-4

Receiver Sensitivity (OMAouter)

SEN



-4.5

dBm

for BER=

2.4x10-4

Stressed Receiver Sensitivity (OMAouter)

SRS



-4.1

dBm


Receiver Reflectance

RR



-26

dB


LOS Assert

LOSA

-30



dBm


LOS Deassert

LOSD



-15

dBm


LOS Hysteresis

LOSH

0.5



dB


Conditions of Stress Receiver Sensitivity Test (Note 4)

Stressed Eye Closure for PAM4 (SECQ)



3.4



dB


Notes:

  1. Average launch power, each lane min is informative and not the principal indicator of signal strength. A transmitter with launch power below this value cannot be compliant; however, a value above this does not ensure compliance

  2. Even if the TDECQ < 1.4dB for an extinction ratio of ≥ 4.5dB or TDECQ < 1.3dB for an extinction ratio of < 4.5dB, the OMAouter (min) must exceed the minimum value specified here.

  3. 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.

  4. Stressed eye closure definition is test condition for measuring stressed receiver sensitivity. It is not a characteristic of the receiver.

    Digital Diagnostic Functions

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


    Parameter

    Symbol

    Min

    Max

    Unit

    Notes

    Temperature monitor absolute error


    DMI_Temp


    -3


    3


    degC

    Over operating temperature range

    Supply voltage monitor absolute error

    DMI _VCC

    -0.1

    0.1

    V

    Over full

    operating range

    Channel RX power monitor absolute error


    DMI_RX_Ch


    -2


    2


    dB


    1

    Channel Bias current monitor

    DMI_Ibias_Ch

    -10%

    10%

    mA


    Channel TX power monitor absolute error

    DMI_TX_Ch

    -2

    2

    dB

    1

    Notes:

    1. Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB fluctuation, or a +/- 3 dB total accuracy


      PIN Assignment and Description


      Table  Description automatically generated with medium confidence

      Figure 2. MSA Compliant Connector



      PIN #

      Logic

      Symbol

      Description

      Notes

      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 Data Input


      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 Receiver

      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 Data Output


      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

      +3.3 V Power Supply transmitter

      2

      30


      Vcc1

      +3.3 V Power Supply

      2

      31

      LVTTL-I

      LPMode

      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


      Notes:

      1. GND is the symbol for signal and supply (power) common for QSFP28 modules. All are common within the QSFP28 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 in Figure

      3. 3 below. Vcc Rx, Vcc1 and Vcc Tx may be internally connected within the QSFP28 transceiver module in any combination. The connector pins are each rated for a maximum current of 1000mA.


Recommended Power Supply Filter


Diagram, schematic  Description automatically generated



Mechanical Dimension


Figure 3. Recommended Power Supply Filter



Diagram  Description automatically generated with medium confidence


ESD

This transceiver is specified as ESD threshold 1kV for SFI APDs and 2kV for all other electrical input APDs, 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 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).


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