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400G QSFP-DD LR8 1310 nm 10 km

Ascent’s QSFP-DD-400G-LR8-10 is a 400 Gb/s Quad Small Form Factor Pluggable-double density (QSFP-DD) optical module designed for 10km optical communication applications over a standard pair of G.652 Single-Mode Fiber (SMF).

    Compliant with IEE 802.3bs standard

    400GBASE-LR8 optical interface

    400GAUI-8 electrical interface

    Compliant with QSFP-DD MSA HW Rev 3.0 with duplex LC connector

    Two-wire serial interface with digital diagnostic monitoring

    Class 1 Laser

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

Absolute Maximum Ratings 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Storage Temperature

TS

‑40


+85

°C


Power Supply Voltage

VCC

‑0.5


3.6

V


Relative Humidity

RH

5


95

%


Data Input Voltage Differential

|VDIP‑VDIN|



1

V


Control Input Voltage

VI

‑0.3


VCC+0.5

V


Control Input Current

I0

‑20


20

mA


 

Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Operating Case Temperature

TOP

0


+70

°C


Instantaneous Peak Current at Hot Plug

ICC_IP



TBD

mA


Sustained Peak Current at Hot Plug

ICC_SP



TBD

mA


Maximum Power Dissipation

PD



TBD

W


Maximum Power Dissipation, Low Power Mode

PDLP



TBD

W


Signaling Speed per Lane

DRL


26.5625


Gbd


Control Input Voltage High

VIH

VCC*0.7


VCC+0.3

V


Control Input Voltage Low

VIL

‑0.3


VCC*0.3

V


Two Wire Serial Interface Clock Rate




400

kHz


Power Supply Noise




50

mVpp


Rx Differential Data Output Load



100


Ω


Operating Distance


2


10000

m


 

Transmitter Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

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



13.2

dBm


Average Launch Power, each Lane

AOPL

‑2.8


5.3

dBm

1

Outer Optical Modulation Amplitude (OMAOUTER), each Lane

TOMA

0.2


2.7

dBm


Difference in Launch Power between any Two Lanes (OMAOUTER), each Lane

DT_OMA



4

dB


Launch Power in OMAOUTER Minus TDECQ, each Lane for ER > 4.5 dB

TOMA‑TDECQ

‑1.2



dBm


Launch Power in OMAOUTER Minus TDECQ, each Lane for ER < 4.5 dB

TOMA‑TDECQ

‑1.1



dBm


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

TDECQ



3.3

dB


Average Launch Power of OFF Transmitter, each Lane

TOFF



‑30

dBm


Extinction Ratio

ER

3.5



dB


RIN15.1 OMA

RIN



‑132

dB/Hz


Optical Return Loss Tolerance

ORL



15.1

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

Notes

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

6.3



dBm


Average Receive Power, each Lane

AOPR

‑9.1


5.3

dBm


Receive Power (OMAOUTER), each Lane

OMAR



5.7

dBm


Difference in Receive Power between any Two Lanes (OMAOUTER), each Lane

DR_OMA



4.5

dB


Receiver Reflectance

RR



‑26

dB


Receiver Sensitivity (OMAOUTER), each Lane

SOMA



‑7.1

dBm

1

Stressed Receiver Sensitivity (OMAOUTER), each Lane

SRS



‑4.7

dBm

2

Notes: 

1. Receiver Sensitivity (OMAOUTER), each lane (max.) is informative and is defined for a transmitter with SECQ of 0.9 dB

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

 

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

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

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


Receiver (Module Output)







AC Common‑Mode Output Voltage (RMS)




17.5

mV


Differential Output Voltage




900

mV


Near‑End Eye Height, Differential


70



UI


Far‑End Eye Height, Differential


30



UI


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


 

Electrical Specification Low Speed Signal (Compliant with QSFP‑DD HW Rev 3.0)

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Module Output SCL and SDA

VOL

0


0.4

V



VOH

VCC‑0.5

VCC+0.3




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


 

Digital Diagnostic Monitoring Information

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)

‑3.5 to +5.3

±3 dB

dBm

nternal

Rx Receive Power (each Lane)

‑9.1 to +5.3

±3 dB

dBm

nternal

 

Timing for Soft Control and Status Functions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

MgmtInit Duration




2000

ms


ResetL Assert Time

t_reset_init

10



µs


IntL Assert Time

ton_IntL



200

ms


toff_IntL

toff_IntL



500

ms


Rx LOS Assert Time

ton_los



100

ms


Tx Fault Assert Time

ton_Txfault



200

ms


Flag Assert Time

ton_flag



200

ms


Mask Assert Time

ton_mask



100

ms


Mask Deassert Time

toff_mask



100

ms


Application or Rate Select Change Time

t_ratesel



N/A

ms

1

Note:

1. This feature is not supported

 

I/O Timing for Squelch and Disable

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Rx Squelch Assert Time

ton_Rxsq



15

ms


Rx Squelch Deassert Time

toff_Rxsq



15

ms


Tx Squelch Assert Time

ton_Txsq



400

ms

1

Tx Squelch Deassert Time

toff_Txsq



400

ms

1

Tx Disable Assert Time

ton_Txdis



100

ms


Tx Disable Deassert Time

toff_Txdis



400

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



100

ms


Squelch Disable Deassert Time

toff_sqdis



100

ms


Note:

1. Not implemented by default


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