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40G QSFP CWDM 20 km

Ascent’s QSFP-AQ-LP-W4-20 is a QSFP transceiver designed to operate over single-mode fiber using 4x10 CWDM channels in 1310 band for data links up to 20 km. The module converts 4 inputs channel of 10 Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40 Gb/s optical transmission. On the receiver side, the module optically de-multiplexes a 40 Gb/s input into 4 CWDM channels signals, and converts them to 4 channel output electrical data.

•    4 CWDM lanes Mux/Demux design

•    Up to 11.1 Gbps Data rate per wavelength

•    Up to 20 km transmission on SMF

•    Electrically hot-pluggable

•    Digital Diagnostics Monitoring Interface

•    Compliant with QSFP+ MSA with LC connector

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

•    Power dissipation < 2.5 W

•    Compliant to IEEE802.3ba

•    Compliant to SFF-8436

•    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‑

‑

Vcc+0.

V


 

 Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Case Operating Temperature

Tcase

0

‑

70

°C

Without air

Power Supply Voltage

VCC

3.1

3.3

3.47

V


Power Supply Current

ICC

‑


760

mA


Data Rate

BR


10.31


Gbp

Each

Transmission Distance

TD


‑

20

km


Coupled fiber

Single‑mode fiber

9/125 µm

 

Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Transmitter







Wavelength

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



8.3

dBm


Average Launch Power per lane


‑7


2.3

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


RIN

RIN



‑128

dB/Hz


Output Eye Mask

Compliant with IEEE 802.3ba

Receiver







Rx Sensitivity per Lane (OMA)

RSENS



‑13.7

dBm

1

Input Saturation Power (Overload)

Psat

2.3



dBm


Receiver Reflectance

Rr



‑26

dB


Notes:

1. Measured with a PRBS 231‑1 test pattern, @10.325 Gb/s, BER<10‑12.

 

Electrical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Supply Voltage

Vcc

3.13

3.3

3.47

V


Supply Current

Icc



760

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

Transmit Disable Assert Time




10

µs


Receiver







Differential Data Output Swing

Vout, pp

300


850

mV

3

Data Output Rise Time

tr

28



ps

4

Data Output Fall Time

tf

28



ps

4

LOS Fault

VLOSfault

Vcc‑1.3


VccHOST

V

5

LOS Normal

VLOS

Vee


Vee+0.8

V

5

Notes:

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

2. Or open circuit.

3. Into 100 Ω differential termination.

4. 20 % to 80 %.

5. Loss Of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.

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