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400G QSFP-DD ER8 40 km

Ascent’s QSFP-DD-ER8-40 is a 400 Gb/s Quad Small Form Factor Pluggable-double density (QSFP-DD) optical module designed for 40 km optical communication applications. It converts 8x 50G 400GAUI-8 PAM4 (Pulse-Amplitude Modulation) electrical input channels (each 53.125Gbps) into 8 Single Lambda 50G PAM4 LAN-WDM optical signals which are multiplexed for transmission over single fiber. On the receiver side, the optical signal is received and de-multiplexed and then QSFP-DD ER8 transceiver converts 8 Single Lambda 50G PAM4 LAN-WDM optical signals into 8x 50G 400GAUI-8 electrical inputs.

    Compliant with IEEE std 802.3cnTM-2019:

    400GBASE-ER8 optical interface

    400GAUI-8 electrical interface

    Compliant with QSFP-DD MSA HW Rev 5.1 with duplex LC connector

    Compliant with QSFP-DD CMIS Rev 4.0

    Case operating temperature 0°C to 70°C

    Two wire serial Interface with digital diagnostic monitoring

    Complies with EU Directive 2011/65/EU (RoHS compliant)

    Class 1/1M Laser


Absolute Maximum Ratings

Parameter

Symbol

Min.

Max.

Unit

Note

Storage Temperature

TS

‑40

85

°C


Supply Voltage

VCC

‑0.5

3.6

V


Relative Humidity (non‑condensing)

RH

5

95

%

Non‑condensing

Data Input Voltage Differential

lVDIP‑VDINl

1

V


Control Input Voltage

VI

‑0.3

VCC+0.5

V


Control Output Voltage

VO

‑20

20

V


 

Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Operating Case Temperature

TOPR

0

70

°C


Power Supply Voltage

VCC

3.135

3.3

3.465

V


Instantaneous Peak Current at Hot Plug

ICC_IP

5600

mA


Sustained Peak Current at Hot Plug

ICC_SP

4620

mA


Maximum Power Dissipation

PD

14

W


Maximum Power Dissipation, Low Power Mode

PDLP

1.5

W


Signaling Rate per Lane

SRL

26.5625

GBd


Control Input Voltage High

VIH

VCC*0.7

VCC+0.3



Control Input Voltage Low

VIL

‑0.3

VCC*0.3



Two Wire Serial Interface Clock Rate

400

kHz


Power Supply Noise Tolerance 

66

mV


Rx Differential Data Output Load

100

Ω


Operating Distance

0.002

40

km

1

Notes:

1. Channel insertion loss is 18 dB for 40 km

 

Transmitter Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Wavelength L0

λC0

1272.55

1273.55

1274.54

nm


Wavelength L1

λC1

1276.89

1277.89

1278.89

nm


Wavelength L2

λC2

1281.25

1282.26

1283.27

nm


Wavelength L3

λC3

1285.65

1286.67

1287.68

nm


Wavelength L4

λC4

1294.53

1295.56

1296.59

nm


Wavelength L5

λC5

1299.02

1300.06

1301.09

nm


Wavelength L6

λC6

1303.54

1304.59

1305.63

nm


Wavelength L7

λC7

1308.09

1309.14

1310.19

nm


Side Mode Suppression Ratio

SMSR

30

dB


Total Average Launch Power

AOPT

14.6

dBm


Average Launch Power, each Lane

AOPL

‑0.6

5.6

dBm

1

Outer Optical Modulation Amplitude (OMAouter), each Lane

TOMA

2.4

6.4

dBm


Difference in Launch Power between any Two Lanes (OMAouter)

DT_OMA

4

dB


Launch Power in OMAouter minus TDECQ, each Lane

TOMA‑TDECQ

1

dBm


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

TDECQ

3.4

dB


TDECQ –10log10(Ceq)

3.4

dB


Average Launch Power of OFF Transmitter, each Lane

TOFF

‑30

dBm


Extinction Ratio

ER

6

dB


RIN15OMA

RIN

‑132

dB/Hz


Optical Return Loss Tolerance

ORL

15

dB


Transmitter Reflectance

TR

‑26

dB

2

Notes:

1. Average launch power, each lane (min) is informative and not the principal indicator of signal strength 

2. Transmitter reflectance is defined looking into the transmitter

 

Receiver Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Wavelength L0

λC0

1272.55

1273.55

1274.54

nm


Wavelength L1

λC1

1276.89

1277.89

1278.89

nm


Wavelength L2

λC2

1281.25

1282.26

1283.27

nm


Wavelength L3

λC3

1285.65

1286.67

1287.68

nm


Wavelength L4

λC4

1294.53

1295.56

1296.59

nm


Wavelength L5

λC5

1299.02

1300.06

1301.09

nm


Wavelength L6

λC6

1303.54

1304.59

1305.63

nm


Wavelength L7

λC7

1308.09

1309.14

1310.19

nm


Damage Threshold, each Lane

AOPD

‑3.4

dBm


Average Receive Power, each Lane

AOPR

‑18.6

‑4.4

dBm


Receive Power (OMAouter), each Lane

OMAR

‑3.6

dBm


Difference in Receive Power between any Two Lanes (OMAouter)

DR_OMA

5.8

dB


Receiver Reflectance

RR

‑26

dB


Receiver Sensitivity (OMAouter), each Lane

SOMA

Max(–16.1, SECQ – 17.5)

dBm

1

Stressed Receiver Sensitivity (OMAouter), each Lane

SRS

‑14.1

dBm

2

Conditions of Stressed Receiver Sensitivity Test

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

3.4

dB


SECQ – 10log10(Ceq), Lane Under Test



3.4

dB


OMAouter of each Aggressor Lane

‑8.3

dBm


Notes:

1. Receiver sensitivity (OMAouter), each lane (max) is informative and is defined for a transmitter with SECQ of 1.4 dB.

2. Measured with conformance test signal at TP3 for the BER = 2.4 x 10‑4

 

Electrical Specification High Speed Signal (Compliant with IEEE 802.3bs 400GAUI‑8)

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Receiver (Module Output)

AC Common‑Mode Output Voltage (RMS)


17.5

mV


Differential Output Voltage


900

mV


Near‑End Eye Height, Differential


70

mV


Far‑End Eye Height, Differential


30

mV


Far End Pre‑Cursor Ratio


2.5

%


Differential Termination Mismatch


10

%


Transition Time (Min., 20% To 80%)


9.5

ps


DC Common Mode Voltage


‑350

2850

mV


Transmitter (Module Input)

Differential pk‑pk Input Voltage Tolerance


900

mV


Differential Termination Mismatch


10

%


Single‑Ended Voltage Tolerance Range


‑0.4

3.3

V


DC Common Mode Voltage


‑350

2850

mV


 

Electrical Specification Low Speed Signal (compliant with QSFP‑DD HW Rev 5.1)

Parameter

Symbol

Min.

Max.

Unit

Note

Module Output SCL and SDA

VOL

0

0.4

V


Module Input SCL and SDA

VIL

‑0.3

VCC*0.3

V



VIH

VCC*0.7

VCC+0.5

V


InitMode, ResetL, and ModSelL

VIL

‑0.3

0.8

V



VIH

2

VCC+0.3

V


IntL

VOL

0

0.4

V



VOH

VCC‑0.5

VCC+0.3

V


 

Timing for Soft Control and Status Functions

Parameter

Symbol

Min.

Max.

Unit

Note

MgmtInit Duration


2000

ms


ResetL Assert Time

t_reset_init

10

µs


IntL Assert Time

ton_IntL

200

ms


IntL Deassert Time

toff_IntL

500

µs


Rx LOS Assert Time

ton_losf

100

ms


Flag Assert Time

ton_flag

200

ms


Mask Assert Time

ton_mask

100

ms


Mask Deassert Time

toff_mask

100

ms


Module Select Wait Time

ModSelL Wait Time

N/A


Not supported

 

I/O Timing for Squelch and Disable    

Parameter

Symbol

Min.

Max.

Unit

Notes

Rx Squelch Assert Time

ton_Rxsq

50

ms


Tx Squelch Assert Time

ton_Txsq

400

ms


Tx Squelch Deassert Time

toff_Txsq

1500

ms

Based on modulation

Tx Disable Assert Time (fast mode)

ton_Txdisf

3

ms


Tx Disable Deassert Time (fast mode)

toff_Txdisf

10

ms


Rx Output Disable Assert Time

ton_Rxdis

100

ms


Rx Output Disable Deassert Time

toff_Rxdis

100

ms


Squelch Disable Assert Time

ton_sqdis

N/A

ms

Not supported

Squelch Disable Deassert Time

toff_sqdis

N/A

ms

Not supported

  

Digital Diagnostics

Parameter

Range

Accuracy

Unit

Calibration

Temperature

0 to 70

±3

°C

Internal

Voltage

0 to VCC

0.1

V

Internal

Tx Bias Current (Each Lane)

0 to 100

10 %

mA

Internal

Tx Output Power (Each Lane)

‑0.6 to +5.6

±3

dB

Internal

Rx Receive Power (Each Lane)

‑18.6 to ‑4.4

±3

dB

Internal

 


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