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400G QSFP-DD DR4 500m

Ascent’s QSFP-DD-DR4-A05 400Gb/s Quad Small Form Factor Pluggable-double density (QSFP- DD) optical module designed for 500m optical communication applications. The module converts 8 channels of 50Gb/s (PAM4) electrical input data to 4 channels of parallel optical signals, each capable of 100Gb/s operation for an aggregate data rate of 400Gb/s. Reversely, on the receiver side, the module converts 4 channels of parallel optical signals of 100Gb/s each channel for an aggregate data rate of 400Gb/s into 8 channels of 50Gb/s (PAM4) electrical output data. An optical fiber cable with an MTP/MPO-12 connector can be plugged into the QSFP- DD DR4 module receptacle. Proper alignment is ensured by the guide pins inside the receptacle. The cable usually cannot be twisted for proper channel to channel alignment. Electrical connection is achieved through an QSFP-DD MSA-compliant edge type connector. The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP-DD Multi-Source Agreement (MSA) Type. It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.

·         QSFP-DD MSA compliant

·         Parallel 4 Optical Lanes

·         IEEE802.3bs Specification compliant

·         Up to 500m transmission on single mode fiber (SMF) with FEC

·         Operating case temperature: 0 to 70°C

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

·         Data Rate 106.25Gbps (PAM4) per channel

·         Maximum power consumption 12W

·         MPO-12 connector

·         RoHS compliant


Absolute Maximum Ratings 

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

 

Parameter

Symbol

Min.

Max.

Unit

Note

Storage Temperature

TS

-40

85

°C


Operating Case Temperature

TOP

0

70

°C


Power Supply Voltage

VCC

-0.5

3.6

V


Relative Humidity (non-condensation)

RH

0

85

%


 Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Operating Case Temperature

TOP

0


70

°C


Power Supply Voltage

VCC

3.135

3.3

3.465

V


Data Rate, each Lane



26.5625


GBd

PAM4

Data Rate Accuracy


-100


100

ppm


Pre-FEC Bit Error Ratio




2.4x10-4



Post-FEC Bit Error Ratio




1x10-13


1

Link Distance

D

0.5


500

km

2

Notes:

1.    FEC provided by host system.

2.     FEC required on host system to support maximum transmission distance.

Electrical Characteristics

The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Power Consumption




12

W


Supply Current

Icc



3.64

A


Transmitter (each Lane)

Signaling Rate, each Lane

TP1

26.5625 ± 100 ppm

GBd


Differential pk-pk Input

Voltage Tolerance

TP1a

900



mVpp

1





Differential Termination

Mismatch

TP1



10

%





Differential Input Return Loss

TP1

IEEE 802.3-2015 Equation

(83E-5)



dB














Differential to Common Mode

Input Return Loss

TP1

IEEE 802.3-2015 Equation

(83E-6)



dB










Module Stressed Input Test

TP1a

See IEEE 802.3bs 120E.3.4.1




2












Single-ended Voltage Tolerance Range (Min)

TP1a

-0.4 to 3.3

V





DC Common Mode Input Voltage

TP1

-350


2850

mV

3

Receiver (each Lane)

Signaling Rate, each lane

TP4

26.5625 ± 100 ppm

GBd










Differential Peak-to-Peak

Output Voltage

TP4



900

mVpp





AC Common Mode Output

Voltage, RMS

TP4



17.5

mV





Differential Termination Mismatch

TP4



10

%


Differential Output Return Loss

TP4

IEEE 802.3-

2015 Equation

(83E-2)













Common to Differential Mode Conversion Return Loss

TP4

IEEE 802.3-

2015 Equation

(83E-3)








Transition Time, 20% to 80%

TP4

9.5



ps


Near-end Eye Symmetry Mask Width (ESMW)

TP4


0.265


UI





Near-end Eye Height, Differential

TP4

70



mV


Far-end Eye Symmetry Mask Width (ESMW)

TP4


0.2


UI





Far-end Eye Height, Differential

TP4

30



mV


Far-end Pre-cursor ISI Ratio

TP4

-4.5


2.5

%


Common Mode Output Voltage (Vcm)

TP4

-350


2850

mV

3

Notes:
               1.         With the exception to IEEE 802.3bs 120E.3.1.2 that the pattern is PRBS31Q or scrambled idle.
               2.         Meets BER specified in IEEE 802.3bs 120E.1.1.
               3.         DC common mode voltage generated by the host. Specification includes effects of ground offset voltage.

 Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Center Wavelength

λc

1304.5

1310

1317.5

nm


Transmitter







Data Rate, each Lane


53.125 ± 100 ppm

GBd


Modulation Format


PAM4



Side-mode Suppression Ratio

SMSR

30

1295.56


dB

Modulated

Average Launch Power, each

Lane

PAVG

-2.9

1300.05

4

dBm

1







Outer Optical Modulation

Amplitude (OMAouter), each Lane

POMA

-0.8

1304.58

4.2

dBm

2







Launch Power in OMAouter minus TDECQ, each Lane


-2.2

1309.14


dB





Transmitter and Dispersion Eye Closure for PAM4, each Lane

TDECQ



3.4

dB





Extinction Ratio

ER

3.5



dB


RIN21.4OMA

RIN



-136

dB/Hz


Optical Return Loss Tolerance

TOL



21.4

dB


Transmitter Reflectance

TR



-26

dB


Average Launch Power of OFF Transmitter, each Lane

Poff



-15

dBm



Receiver

Data Rate, each Lane


53.125 ± 100 ppm



GBd




Modulation Format


PAM4





Damage Threshold, each Lane

THd

5



dBm

3

Average Receive Power, each Lane


-5.9


4

dBm

4

Receive Power (OMAouter), each Lane




4.2

dBm


Receiver Sensitivity (OMAouter), each Lane

SEN



-4.4

dBm

5

Stressed Receiver Sensitivity (OMAouter), each Lane

SRS



-1.9

dBm

6





Receiver Reflectance

RR



-26

dB


LOS Assert

LOSA

-30



dBm


LOS De-assert

LOSD



-12

dBm


LOS Hysteresis

LOSH

0.5



dB


Stressed Conditions for Stress Receiver Sensitivity (Note 7)

Stressed Eye Closure for PAM4 (SECQ), Lane under Test



3.4


dB




OMAouter of each Aggressor Lane



4.2


dBm


   Notes:

 1.          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.

 2.          Even if the TDECQ < 1.4 dB, the OMAouter (min) must exceed the minimum value specified here.

 3.          The receiver shall be able to tolerate, without damage, continuous exposure to an optical input signal having this average power level.

 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 informative and is defined for a transmitter with SECQ of 0.9 dB.

 6.          Measured with conformance test signal for BER = 2.4x10-4.

 7.          These test conditions are for measuring stressed receiver sensitivity. They are not characteristics of the receiver.

 

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Digital Diagnostic Functions

Parameter

Symbol

Min.

Max.

Unit

Note

Temperature Monitor Absolute Error

DMI_Temp

-3

3

°C

Over operating temperature range






Supply Voltage Monitor Absolute Error

DMI _VCC

-0.1

0.1

V

Over full operating

range






Channel RX Power Monitor Absolute Error

DMI_RX_Ch

-2

2

dB

1

Channel Bias Current Monitor

DMI_Ibias_Ch

-10%

10%

mA


Channel TX Power Monitor Absolute Error

DMI_TX_Ch

-2

2

dB

1

    Notes:
              
1.          Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB fluctuation, or a +/- 3 dB total accuracy.

 ESD
      This transceiver is specified as ESD threshold 1kV for high-speed data pins and 2kV for all other electrical input pins, tested per MIL-STD-883, Method 3015.4 /JESD22-A114-A (HBM).
      However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD-protected environment.
 
 Laser Safety
      This is a Class 1 Laser Product according to EN 60825-1:2014. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).

 Caution: Use of controls, adjustments, or performance of procedures other than those specified herein may result in hazardous radiation exposure.

 


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