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400G OSFP SR4 FLT 50m Transceiver

Ascent’s 400Gb/s Octal Small Form-factor Pluggable (OSFP) optical module without a top open fin is designed for Ethernet, Telecom and InfiniBand use cases and can be used to reach 50m with OM4 fiber optical communication applications with Forward Error Correction (FEC). This module converts 4 channels of 100G-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 4 channels of 100Gb/s (PAM4) electrical output data. MPO-12 connector can be plugged into the OSFP112 SR4 module jack with 4 channels. Proper alignment is ensured by the guide pins inside the receptacle. The cable usually cannot be twisted for proper channel-to-channel alignment. The I2C interface is supported to read and control the status of this product. The electrical connection is achieved through an OSFP MSA-compliant edge-type connector.

·          IEEE 802.3cd, IEEE 802.3bs Annex120E

·       Adaptive Tx input equalization

·       Programmable Rx output amplitude

·       Programmable Rx output pre-cursor

·       Programmable Rx output post-cursor

·       Supply voltage monitoring (DDM_Voltage)

·       Transceiver case temperature monitoring (DDM_Temperature)

·       Tx transmit optical power monitoring for each lane (DDM_TxPower)

·       Tx bias current monitoring for each lane (DDM_TxBias)

·       Rx receive optical power monitoring for each lane (DDM_RxPower)

·       Warning and alarm indication for each DDM function

·       Tx & Rx LOL and LOS indication

·       Tx fault indication

·       Host and line side loopback capabilities

·       Host and line side PRBS generator and checker capabilities

·       CDB firmware upgrade capability

·       Versatile diagnostics monitoring (VDM) capability (optional, additional power consumption increase)

·       Other functions defined in CMIS

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

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



53.125


GBd

PAM4

Data Rate Accuracy


-100


100

ppm


Pre-FEC Bit Error Ratio




2.4x10-4



Post-FEC Bit Error Ratio




1x10-12


1

Link Distance (OM3)

D1

2


50

m

2

  Link Distance (OM4)

  D2

  2


  30

  m

Electrical Characteristics

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

Parameter

Test Point

Min.

Typ.

Max.

Unit


Power Consumption




9.0

W


Supply Current

Icc



2.87

A


Transmitter (Each Lane)

Signaling Rate, Each Lane

TP1

53.125 ± 100 ppm

GBd


Differential Pk-Pk Input Voltage Tolerance

TP1a

750



mV


Peak-To-Peak AC Common-Mode Voltage

Tolerance Low-Frequency, VCMLF Full-band, VCMFB

TP1a

32

80



mV


Differential-Mode To Common-Mode Return

Loss, RLcd

TP1

IEEE 802.3ck Equation (120G–2)

dB


Effective Return Loss, ERL

TP1

8.5



dB


Differential Termination Mismatch

TP1a



10

%


Module Stressed Input Tolerance

TP1a

IEEE802.3ck 120G.3.4.3

V


Single-Ended Voltage Tolerance Range

TP1

-0.4 to 3.3



mV


DC Common-Mode Voltage Tolerance

Upper Limit

Lower Limit

TP1

2.85

-0.35

V

v


Receiver (Each Lane)

Signaling Rate, Each Lane

TP4

53.125 ± 100 ppm

GBd


Peak-To-Peak AC Common-Mode Voltage

Low-Frequency, VCMLF

Full-Band, VCMFB

TP4



32

80

mV


Differential Peak-To-Peak Output Voltage

Short Mode

Long Mode

TP4



600

845

mV

mV


Eye Height

TP4

15



mV


Vertical Eye Closure, VEC

TP4



12

dB


Common-Mode To Differential-Mode Return

Loss, RLdc

TP4

IEEE802.3ck Equation (120G– 1)



dB


Effective Return Loss, ERL

TP4

8.5



dB


Differential Termination Mismatch

TP4



10

%


Transition Time

TP4

8.5



ps


DC Common-Mode Voltage Tolerance

Upper Limit

Lower Limit

TP4

2.85

-0.35

mV


Optical Characteristics

  Parameter

  Symbol

  Min.

  Typ.

  Max.

  Unit

  Note

  Transmitter

Data Rate, Each Lane


53.125 ± 100 ppm

GBd


Modulation Format


PAM4



Wavelength

λ

842


948

nm


RMS Spectral Width




0.65

nm

1

Average Launch Power, Each Lane

PAVG

-4.6


4

dBm


Outer Optical Modulation Amplitude

(OMAouter), Each Lane

POMA

-2.6(For max (TECQ, TD

ECQ) ≤ 1.8 dB)-4.4

+max(TECQ, TDECQ)(For

1.8 ＜max (TECQ, TDECQ)

≤ 4.4dB)


 

3.5

dBm


Transmitter and Dispersion Eye Closure

for PAM4 (TDECQ), Each Lane

TDECQ



 

4.4

dB


Transmitter Eye Closure for PAM4, Each Lane

TECQ



 

4.4

dB


Overshoot/Undershoot




29

%


Transmitter Power Excursion, Each Lane




2.3

dBm


Extinction Ratio

ER

2.5



dB


Transition Time

TT



17

ps


Average Launch Power Of OFF Transmitter,

Each Lane

PoFF



-30

dBm


RIN14 OMA

RIN



-132

dB/Hz


Optical Return Loss Tolerance

TOL



14

dB


Encircled Flux


≥ 86% at 19 μm

≤ 30% at 4.5 μm


 

2

Receiver


Data Rate, Each Lane


53.125 ± 100 ppm

GBd


Modulation Format


PAM4



Center Wavelength

λ

842


948

Nm


Damage Threshold, Each Lane

THD

5



dBm

3

Average Receive Power, Each Lane


-6.3


4

dBm

4

Receive Power (OMAouter), Each Lane




3.5

dBm


Receiver Reflectance

RR



-15

dB


Receiver Sensitivity

(OMAouter), Each Lane

SEN



-4.4 (For TECQ

≤ 1.8 dB) – 6.2

+TECQ (For 1.8

< TECQ ≤ 4.4 dB)

dBm

 

5

Stressed Receiver Sensitivity (OMAouter),

Each Lane

SRS



-1.8

dBm

6

LOS Assert

LOSA

-15



dBm


LOS De-assert

LOSD



-9.2

dBm


LOS Hysteresis

LOSH

0.5



dB


Conditions of Stress Receiver Sensitivity Test (Note 7)

Stressed Eye Closure for PAM4 (SECQ),

Lane under Test



4.4


dB


OMAouter of each aggressor lane



3.5


dBm


1. FEC provided by host system.Notes:

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

1. RMS spectral width is the standard deviation of the spectrum.Notes:

2. If measured into type A1a.2 or type A1a.3, or A1a.4, 50 μm fiber, by IEC 61280- 1-4.

3. The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. 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) is informative and is defined for a transmitter with a value of TECQ up to 4 dB. Receiver sensitivity should meet Equation (1), which is illustrated in figure below.

RS = max (−4.4, TECQ – 6.2) dBm (1)

Where:

RS is the receiver sensitivity, and

TECQ is the TECQ of the transmitter used to measure the receiver sensitivity.

6. Measured with conformance test signal at TP3 for the BER equal to 2.4x10-4.

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

image.png

                                                                                                          Illustration of Receiver Sensitivity Mask for 400G-SR4

Digital Diagnostic Functions

The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

  Parameter

  Symbol

  Min

  Max

  Unit

  Notes

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


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

image.png
Illustration of Receiver Sensitivity M
image.png

Transceiver Block Diagram











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