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400G QSFP-DD 40 km

The Ascent QSFP-DD-ER4-40 is a high-performance, hot-pluggable optical transceiver designed for 400 Gigabit Ethernet applications requiring transmission distances of up to 40 km over single-mode fiber. Fully compliant with IEEE 802.3bs 400GBASE-ER4, QSFP-DD MSA, and CMIS specifications, the module delivers reliable long-reach optical connectivity for carrier networks, data center interconnect (DCI), cloud infrastructure, and enterprise backbone applications. The transceiver employs four LAN-WDM optical wavelengths, each operating at 106.25 Gb/s PAM4, to achieve an aggregate data rate of 425 Gb/s through a duplex LC optical interface. Advanced EML transmitters, PIN receivers, integrated DSP technology, and low-power architecture provide excellent signal integrity, superior transmission performance, and power consumption below 12 W. Supporting comprehensive Digital Diagnostic Monitoring (DDM) through the CMIS management interface, the module enables real-time monitoring of temperature, voltage, transmit bias, transmit power, and received optical power. Its compact QSFP-DD form factor, high reliability, and broad platform interoperability make it an ideal solution for next-generation Ethernet switches, routers, optical transport equipment, AI infrastructure, and metro network deployments.

·         Supports 400GBASE-ER4

·         Lane bit rate 106.25Gb/s with PAM4

·         Up to 40km transmission on SMF

·         Narrow LANWDM laser and PIN receiver

·         8x53.125Gb/s with PAM4 electrical interface (400GAUI-8)

·         I2C interface with integrated Digital Diagnostic monitoring

·         QSFP-DD MSA package with duplex LC connector

·         Single +3.3V power supply

·         Maximum power consumption 12W

·         Operating case temperature: 0 to +70°C

·         Compliant to QSFP-DD CMIS standard

·         Compliant to 802.3bs & QSFP-DD Hardware Specification

·         Complies with EU Directive 2015/863/EU



Absolute Maximum Ratings

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Storage Temperature

TS

-40

-

+85

°C


Supply Voltage

VCC

-0.5

-

+3.6

V


Operating Relative Humidity

RH

5

-

+85

%


 Recommended Operating Conditions 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Operating Case Temperature

TC

0

-

+70

°C


Power Supply Voltage

VCC

3.13

3.3

3.47

V


Maximum Power Consumption

PD

-

-

12

W


Aggregate Bit Rate

BRAVE

-

425

-

Gb/s

With PAM4

Lane Bit Rate

BRLANE

-

106.25

-

Gb/s

With PAM4

Transmission Distance

TD

-

-

40

km

Over SMF

Optical Characteristics

Transmitter

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Center Wavelength Lane 0

λ0

1304.06

1304.58

1305.1

nm


Center Wavelength Lane 1

λ1

1306.33

1306.85

1307.38

nm


Center Wavelength Lane 2

λ2

1308.61

1309.14

1309.66

nm


Center Wavelength Lane 3

λ3

1310.9

1311.43

1311.96

nm


Average Launch Power per Lane

PTX_LANE

1.5

-

7.1

dBm

1

OMAouter per Lane

OMAouter

4.5

-

7.9

dBm

2

Transmitter and Dispersion Eye Closure for PAM4 (TDECQ), per Lane

TDECQ

-

-

3.9

dB


Average Output Power (Laser Turn off)

POUT-OFF

-

-

-30

dBm


Side Mode Suppression Ratio

SMSR

30

-

-

dB


Extinction Ratio

ER

6

-

-

dB


Receiver

Center Wavelength Lane 0

λ0

1304.06

1304.58

1305.1

nm


Center Wavelength Lane 1

λ1

1306.33

1306.85

1307.38

nm


Center Wavelength Lane 2

λ2

1308.61

1309.14

1309.66

nm


Center Wavelength Lane 3

λ3

1310.9

1311.43

1311.96

nm


Damage Threshold, per Lane

Pdamage

-2.4

-

-


3

Average Rx Power per Lane

PRx _LANE

-16.2

-

-3.4

dBm

4

Receiver Sensitivity (OMAouter), per Lane

Sens_OMA

-

-

-14

dBm

5

Notes:

1.       The optical power is launched into SMF.
2.       Even if the TDECQ<1.4db for="" an="" extinction="" ratio="" of="">=4.5dB or TDECQ<1.3dB for an extinction ration of <4.5dB, the OMAouter (min) must exceed this value.
3.       The receiver shall be able to tolerate, without damage, continuous exposure to an optical input signal having this average power level. The receiver does not have to operate correctly at this input power.
4.       Average receive power, each lane (min) is informative and not the principal indicator of signal strength. A received power below this value cannot be compliant; however, a value above this does not ensure compliance.
5.       Receiver sensitivity (OMAouter),each lane (max) is defined with BER=2.4E-4.


Electrical Characteristics
High-Speed Signal: Compliant to 400GAUI-8 (IEEE 802.3bs)
Low-Speed Signal: Compliant to QSFP-DD Hardware

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Differential Data Input Amplitude

VIN,P-P

900

-

-

mVpp


Differential Termination Mismatch


-

-

10

%


Receiver (Module Output)

Differential Data Output Amplitude

VOUT,P-P

-

-

900

mVpp


Differential Termination Mismatch (1MHZ）


-

-

10

%


Low-speed Electrical Interface

LPMode/TxDis, ResetL,

ModSelL and EPPS/Clock

VIL

-0.3

-

0.8

V


VIH

2.0

-

VCC+0.3

V


 

ModPrsL

VOL

0

-

0.4

V


VIH

ModPrsL can be implemented as a short-circuit to GND on the module

 

IntL/RxLOS

VOL

0

-

0.4

V


VOH

VCC-0.5

-

VCC+0.3

V



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