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100G QSFP28 CWDM4 1310 nm 2 km

Ascent’s QSFP-28-100G-LP-02 transceiver is designed to operate over single-mode fiber system using 4x25 CWDM channels in 1310 band and links up to 2 km over single-mode fiber. The module converts 4 inputs channel of 25 Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 100 Gb/s optical transmission. On the receiver side, the module optically demultiplexes a 100 Gb/s input into 4 CWDM channels signals, and converts them to 4 channel outputs of electrical data.

    4 CWDM lanes mux/demux design

    Built-in CDR on both TX and RX

    Up to 25.78 Gbps data rate per wavelength

    Up to 2 km transmission on SMF

    Electrically hot-pluggable

    Digital Diagnostics Monitoring Interface

    Compliant with QSFP28 MSA with LC connector

    Case operating temperature range:0°C to 70°C

    Power dissipation < 3.5 W

    Compliant to IEEE802.3ba and 100G CLR4/CWDM4

    Compliant to SFF-8636

    RoHS 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

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

3.13

3.3

3.47

V


Power Supply Current

Icc


1060

mA


Data Rate

BR


25.78125


Gbps

Each channel

Transmission Distance

TD


2

km


Coupled fiber

Single‑mode fiber

9/125 µm SMF

 

Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter 







Wavelength Assignment

λ0

1264.5

1271

1277.5

nm


λ1

1284.5

1291

1297.5

nm


λ2

1304.5

1311

1317.5

nm


λ3

1324.5

1331

1337.5

nm


Total Output Power

POUT



8.5

dBm


Average Launch Power per lane


‑6.5


2.5

dBm


Spectral Width (‑20 dB)

σ



1

nm


SMSR


30



dB


Optical Extinction Ratio

ER

3.5



dB


Average launch Power Off per Lane

Poff



‑30

dBm


Transmitter and Dispersion Penalty per lane

TDP



3

dB


RIN

RIN



‑130

dB/Hz


Output Eye Mask definition

{X1, X2, X3, Y1, Y2, Y3}

{0.31, 0.4, 0.45, 0.34, 0.38, 0.4}

1

Receiver 







Rx Sensitivity per lane

RSENS



‑11.5

dBm

2

Input Saturation Power (Overload)

Psat



2.5

dBm


Receiver Reflectance

Rr



‑26

dB


Notes:

1. Hit ratio 5*10‑5.

2. Measured with a PRBS 231 ‑ 1 test pattern @ 25.78 Gb/s, BER < 5*10‑5.

 

Electrical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Supply Voltage

Vcc

3.13

3.3

3.47

V


Supply Current

Icc



1060

mA


Transmitter 







Input Differential Impedance

Rin


100


Ω

1

Differential Data Input Swing

Vin,pp

180


1000

mV


Transmit Disable Voltage

VD

Vcc–1.3


Vcc

V


Transmit Enable Voltage

VEN

Vee


Vee+ 0.8

V

2

Receiver 







Differential Data Output Swing

Vout, pp

300


850

mV

3

 Notes:

1. Connected directly to TX data input pins. AC coupled thereafter.

2. Or open circuit.

3. Into 100 Ω differential termination.


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