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100G QSFP28 SR4 850 nm 100 m

Ascent ’s QSFP 28-100 G-SR01 is a 100 Gb/s transceiver module designed for optical communication applications compliant to IEEE 802.3bm standards. 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. 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. 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.

·       Hot pluggable QSFP28 MSA form factor

·       Compliant to Ethernet 100GBASE-SR4

·       Supports 103.1 Gb/s aggregate bit rate

·       Up to 100 m reach with OM4 multimode fiber

·       Up to 70 m reach with OM3 multimode fiber

·       Single +3.3V power supply

·       Operating case temperature: 0 °C to 70 °C

·       <2.0 W power dissipation

·       High reliability 850 nm VCSEL technology

·       Standard 12 lane with MPO male connector

·       Compliant with SFF-8636

·       RoHS and FCC compliant

Absolute Maximum Ratings

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Storage Temperature

TS

‑40


85

°C


Relative Humidity 

RH

5


95

%


Power Supply Voltage

Vcc

‑0.3


4.0

V


Signal Input Voltage


Vcc‑0.3


Vcc+0.3

V


Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Case Operating Temperature

Tcase

0

-

70

°C

Without air flow

Power Supply Voltage

Vcc

3.14

3.3

3.46

V


Power Supply Current

Icc

-

600

mA



Data Rate

BR

25.78125


Gbps

Each channel


Transmission Distance

TD

-

100

m

OM4



TD

-

70

m

OM3


Note:

100G Ethernet &100GBASE-SR4 and ITU-T OTU4 has different register setting, not auto-negotiation

Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

 Transmitter

Case Operating Temperature

λ0

840


860

nm


Average Launch Power each lane


-8.4


2.4

dBm


Spectral Width (RMS)

σ



0.6

nm


Optical Extinction Ratio

ER

3



dB


Optical Return Loss Tolerance

ORL



12

dB


Output Eye Mask

Compliant with IEEE 802.3bm-2015

1

Receiver

Receiver Wavelength

λin

840


860

nm


Rx Sensitivity per lane

RSENS



-10.3

dBm

2

LOS De-Assert

LOSD

-30



dBm


LOS Assert

LOSA



-12

dBm


Input Saturation Power (Overload)

Psat

2.4



dBm


Receiver Reflectance

Rr



-12

dB


Notes:

1.   Hit ratio 1.5*10-5 hits per sample

2.   Measured with a PRBS 231-1 test pattern, @ 25.78 Gb/s, BER<10-12.

Electrical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Supply Voltage

 Vcc

3.14

3.3

3.46

V


Supply Current

 Icc



600

mA


Transmitter







Input Differential Impedance

 Rin


100


Ω

1

Differential Data Input Swing

 Vin, pp

 180


1000

mV


Single Ended Input Voltage Tolerance

 VinT

-0.3


4.0

V


Receiver







Differential Data Output Swing

 Vout, pp

300


850

mV

2

Single-Ended Output Voltage


-0.3


4.0

V


Notes:

1.   Connected directly to TX data input pins. AC coupled there after.

2.   Into 100 Ω differential termination.


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