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400G QSFP-DD 30 km

The Ascent QSFP-DD-ER4L-30 is a high-performance hot-pluggable optical transceiver designed for 400 Gigabit Ethernet applications requiring transmission distances of up to 30 km over single-mode fiber. Fully compliant with the QSFP-DD MSA, CMIS, and IEEE 802.3bs electrical interface specifications, the module provides reliable and cost-effective optical connectivity for cloud data centers, enterprise backbone networks, metro aggregation, and telecom transport applications. The transceiver employs four LAN-WDM optical wavelengths, each operating at 106.25 Gb/s PAM4, to deliver an aggregate data rate of 425 Gb/s through a duplex LC optical interface. Advanced EML transmitters, PIN receivers, and an integrated DSP architecture ensure excellent signal integrity, low latency, and outstanding optical performance while maintaining low power consumption. Supporting comprehensive Digital Diagnostic Monitoring (DDM) through the CMIS management interface, the module enables real-time monitoring of temperature, voltage, optical power, and laser bias current. Its compact QSFP-DD form factor, high reliability, and broad platform compatibility make it an ideal solution for next-generation Ethernet switches, routers, AI infrastructure, data center interconnect (DCI), and carrier networks.


·         Supports 400GBASE-ER4-30

·         Lane bit rate 106.25Gb/s with PAM4

·         Up to 30km transmission on SMF

·         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

-

-

30

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

0

-

5.6

dBm

1,2

OMAouter per Lane

OMAouter

3

-

6.4

dBm


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

TDECQ

-

-

3.9

dB


Channel Power Difference

PTX_Delta

-

-

3

dB


Average Output Power (Laser Turn Off)

POUT-OFF

-

-

-15

dBm


Side Mode Suppression Ratio

SMSR

30

-

-

dB


Extinction Ratio

ER

5

-

-

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

-14.7

-

-3.4

dBm

4

Receiver Sensitivity (OMAouter), per Lane

Sens_OMA

-

-

-12.5

dBm

5

Notes:

1.   The optical power is launched into SMF.

2.   Average launch power, each lane (min) is informative and not the principal indicator of signal strength. A transmitter with launch power below this value cannot be compliant; however, a value above this does not ensure 
      compliance.

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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