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Optical Transceiver

100G 100m QSFP28 SR4 Optical Transceiver

WTQ28-85SR4-M1B
WTQ28-85SR4-M1B are designed for use in 100 Gigabit per second links over multimode fiber. They are compliant with the QSFP28 MSA and IEEE 802.3bm
The optical transmitter portion of the transceiver incorporates a 4-channel VCSEL (Vertical Cavity Surface Emitting Laser) array, a 4-channel input buffer and laser driver, diagnostic monitors, control and bias blocks.
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Product Description

Multimode,100G,100m, MPO Connector, withDDM

Product Features

*  Maximum link length of 100m links on OM4 multimode fiber
*  Up to 27.952 Gbps Data rate per channel
* Electrically hot-pluggable
* Digital diagnostic SFF-8636 compliant
* Compliant with QSFP28 MSA
* Case operating temperature range:0°C to 70°C
* Power dissipation <2 W
* 4x25Gb/s 850mm VCSEL-based transmitter
* 4x25G electrical interface
* Single 3.3V power supply
* RoHS-6 compliant
* Single MPO12 receptacle

Applications

* 100G Ethernet &100GBASE-SR4
* ITU-T OTU4

General Description

WTQ28-85SR4-M1B are designed for use in 100 Gigabit per second links over multimode fiber. They are compliant with the QSFP28 MSA and IEEE 802.3bm    

The optical transmitter portion of the transceiver incorporates a 4-channel VCSEL (Vertical Cavity Surface Emitting Laser) array, a 4-channel input buffer and laser driver, diagnostic monitors, control and bias blocks. For module control, the control interface incorporates a Two Wire Serial interface of clock and data signals. Diagnostic monitors for VCSEL bias, module temperature, transmitted optical power，received optical power and supply voltage are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes. Flags are set and interrupts generated when the attributes are outside the thresholds. Flags are also set and interrupts generated for loss of input signal (LOS) and transmitter fault conditions. All flags are latched and will remain set even if the condition initiating the latch clears and operation resumes. All interrupts can be masked and flags are reset by reading the appropriate flag register. The optical output will squelch for loss of input signal unless squelch is disabled. Fault detection or channel deactivation through the TWS interface will disable the channel. Status, alarm/warning and fault information are available via the TWS interface.

The optical receiver portion of the transceiver incorporates a 4-channel PIN photodiode array, a 4-channel TIA array, a 4 channel output buffer, diagnostic monitors, and control and bias blocks. Diagnostic monitors for optical input power are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes. Flags are set and interrupts generated when the attributes are outside the thresholds. Flags are also set and interrupts generated for loss of optical input signal (LOS). All flags are latched and will remain set even if the condition initiating the flag clears and operation resumes. All interrupts can be masked and flags are reset upon reading the appropriate flag register. The electrical output will squelch for loss of input signal (unless squelch is disabled) and channel de-activation through TWS interface. Status and alarm/warning information are available via the TWS interface.

Absolute Maximum Ratings

Parameter

Symbol

Min

Max

Unit

Notes

Storage Temperature

TS

-40

85

°C

Relative Humidity

RH

5

95

%

Power Supply Voltage

VCC

-0.3

3.6

V

Signal Input Voltage

Vcc-0.3

Vcc+0.3

V

Recommended Operating Conditions

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Case Operating Temperature

Tcase

0

70

ºC

Without air flow

Power Supply Voltage

VCC

3.14

3.3

3.46

V

Data Rate, each Lane

BR

25.78125

Gb/s

Each channel

Power Supply Current

ICC

600

mA

Bit Error Ratio

BER

5*10-5

Transmission Distance

TD

70

m

OM3 MMF

Transmission Distance

TD

100

m

OM4 MMF

Electrical Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

note

Supply Voltage

Vcc

3.14

3.3

3.46

V

Supply Current

Icc

600

mA

Module Power

P

2

W

Transmitter

Input differential impedance

Rin

80

100

120

Ω

1

Differential data input swing

Vin,pp

180

1000

mV

Single ended input voltage tolerance

VD

Vcc–1.3

Vcc

V

Transmit Enable Voltage

VinT

-0.3

4

V

Receiver

Differential data output swing

Vout,pp

300

850

mV

2

Single-ended output voltage

-0.3

4

V

Notes:

  1. Connected directly to TX data input pins. AC coupled thereafter.
  2. Into 100Ω ohms differential termination.

Optical Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter

Signaling Speed per Lan

25.78125 ±100 ppm

GBd

Center Wavelength

λ0

840

850

860

nm

Average Launch Power each lane

-8.4

2.4

dBm

Spectral Width (RMS)

σ

0.6

nm

Optical Extinction Ratio

ER

2

dB

Optical Power OMA, each Lane

POMA

-6.4

3

dBm

Optical Return Loss Tolerance

ORL

12

dBm

Output Eye Mask

Compliant with IEEE 802.3bm

Receiver

Signaling Speed per Lan

25.78125 ±100 ppm

GBd

Center Wavelength

λ0

840

850

860

nm

Rx Sensitivity per lane

RSENS

-10.3

dBm

1

LOS De-Assert

LOSD

-11.5

dBm

LOS Assert

LOSA

-30

dBm

Input Saturation Power (Overload)

Psat

2.4

dBm

Receiver Reflectance

Rr

-12

dB

Note：

1.Measured with a PRBS 2 31 -1 test pattern, @25.78Gb/s, BER<5.2*10 -5 .

Pin Assignment and Description

Pin Assignment

PIN

Symbol

Description

Notes

1

GND

Ground

1

2

Tx2n

Transmitter Inverted Data Input

3

Tx2p

Transmitter Non-Inverted Data output

4

GND

Ground

1

5

Tx4n

Transmitter Inverted Data Input

6

Tx4p

Transmitter Non-Inverted Data output

7

GND

Ground

1

8

ModSelL

Module Select

9

ResetL

Module Reset

10

VccRx

+3.3V Power Supply Receiver

2

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

1

17

Rx1p

Receiver Non-Inverted Data Output

18

Rx1n

Receiver Inverted Data Output

19

GND

Ground

1

20

GND

Ground

1

21

Rx2n

Receiver Inverted Data Output

22

Rx2p

Receiver Non-Inverted Data Output

23

GND

Ground

1

24

Rx4n

Receiver Inverted Data Output

1

25

Rx4p

Receiver 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

2

31

LPMode

Low Power Mode

32

GND

Ground

1

33

Tx3p

Transmitter Non-Inverted Data Input

34

Tx3n

Transmitter Inverted Data Output

35

GND

Ground

1

36

Tx1p

Transmitter Non-Inverted Data Input

37

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 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 500mA.