Ascent’s 400G ZR QSFP-DD Digital Coherent Optic Modules are 400 Gb/s Quad Small Form Factor Pluggable-double density (QSFP-DD) transceivers designed for 80 km optical communication applications over a standard pair of G.652 Single-Mode Fiber (SMF).
• Supports flex-grid channel spacing DWDM in C-band
• Supports client-side Interfaces: 400GAUI-8
• Support Line-side DP-16QAM with CFEC
• Standard QSFP-DD type 2 form factor
• 76-pin QSFP-DD MSA compliant connector
• Compliant to CMIS 5.0
• Compliant to OIF Implementation Agreement for Coherent CMIS, Rev 01.1
• RoHS compliant
The absolute maximum ratings given in the table below define the damage thresholds. Hence, the component shall withstand the given limits without any irreversible damage.
Min. | Max. | Unit | Note | |
Storage Temperature | ‑40 | 85 | °C | |
Storage Humidity (Relative) | ‑ | 85 | % | Non‑condensing |
Case Temperature | 0 | 75 | °C | |
Operating Humidity (Relative) | ‑ | 85 | % | Non‑condensing |
Short term Operating Case Temperature | 80 | °C | <24 hours | |
Power Supply Absolute Range | ‑0.3 | 3.63 | V | |
RX Optical Max.imum Input Power | ‑ | 10 | dBm |
Operating Conditions
Parameter | Min. | Max. | Unit | Note |
Operating Case Temperature | 0 | 75 | °C | |
Operating Humidity (Relative) | ‑ | 85 | % | no‑Condensing |
Power Supply Operating Range | 3.135 | 3.465 | V | |
RX Optical Input Power | ‑ | 0 | dBm |
Power Supply
The 400G ZR QSFP‑DD DCO is a Power Class 8 module. In order to avoid exceeding the host system power capacity, upon hot‑plug, power cycle or reset, all QSFP‑DD modules shall power up in Low Power Mode if LPMode is asserted. If LPMode is not asserted the module will proceed to High Power Mode withou t host intervention. Specification values for maximum instantaneous, sustained and steady state currents at each power class are given in table 5. The power supply requirements are specified in the table below.
Parameter | Min. | Typ. | Max. | Unit | Note |
3.3V DC Power Supply Voltage | 3.135 | 3.3 | 3.465 | V | |
3.3V DC Power Supply Current | 7 | A | |||
Power Dissipation | 18 | W | |||
Low Power Consumption | 1.5 | W | |||
Module Inrush Current | 100 | mA/us | |||
Turn‑off Current | ‑100 | mA/us | |||
Power Supply Noise | 25 | mV |
High Speed Electrical Specifications
The transmitter and receiver comply with the CEI‑56G‑VSR‑PAM4 electrical specification (OIF‑CEI‑04.0).
The data lines are AC‑coupled and terminated in the module per the following figure from the QSFP‑DD MSA. The high‑speed signals follow the electrical specifications of CEI‑56G‑VSR‑PAM as defined in OIF‑CEI‑04.0.
The high speed signals consist of 8 transmit and 8 receive differential pairs identified as TX[8:1]p / TX[8:1]n and RX[8:1]p / RX[8:1]n. These signals can be operated in 400GAUI‑8 depending on the capability of the host.400GAUI‑8 mode provides 8 differential lanes using PAM4 signaling operating at 26.5625 GBaud. This results in 8 lanes of 50Gb/s for a total of 400Gb/s. This mode allows connection to PMD configurations of 400GUAI‑8.
The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.
Electrical Characteristics for Transmitter
Parameter | Min. | Typ. | Max. | Unit | Note |
Signal Rate, each Lane | 26.5625±100ppm | GBaud | |||
Differential Peak‑Peak Input Voltage Tolerance | 900 | mVpp |
Electrical Characteristics for Receiver
Parameter | Min. | Typ. | Max. | Unit | Note |
Signal Rate, each Lane | 26.5625±100ppm | GBaud | |||
Differential Peak‑Peak Input Voltage Tolerance | 750 | 900 | mVpp | ||
Transition Time, 20% to 80% | 9.5 | ps |
Optical Specifications
All specifications given in this document are End‑of‑Life numbers and are valid under operating conditions unless specific noted:
Optical Transmitter Specifications
Parameter | Min. | Typ. | Max. | Unit | Notes |
Transmitter Frequency Range | 1528.77 | 1547.72 | 1567.13 | Nm | C band 75GHz ITU‑T grid. Frequency range over which the specifications hold unless noted otherwise. |
Laser Frequency Stability | ‑1.8 | 1.8 | GHz | Frequency stability relative to ITU grid. | |
Laser Frequency Accuracy | ‑1.8 | 1.8 | GHz | ||
Laser Frequency Fine Tuning Range | ‑6.0 | 6.0 | GHz | ||
Fine Tuning Resolution | 100 | MHz | |||
Channel Tuning Speed | ‑ | 60 | s | ||
Laser LineWidth | 100 | kHz | |||
Transmitter Output Power Range | ‑10 | ‑6 | dBm | ||
Transmitter Laser Disable Time | 180 | ms | |||
Output Power Stability | ‑0.5 | 0.5 | dB | Difference over temperature, time, wavelength and aging. | |
Output Power Accuracy | ‑2 | 2 | dB | Difference between the set value and actual value over aging. | |
Transmitter Turn‑up Time from Cold Start | ‑ | 120 | s | ||
Transmitter OSNR (Inband) | 34 | ‑ | dB/0.1nm | ||
Transmitter Back Reflectance | ‑ | ‑24 | dB | ||
Transmitter Output Power with TX Disabled | ‑ | ‑20 | dBm | ||
Transmitter Polarization Dependent Power | ‑ | 1.5 | dB | Power deference between X and Y polarization |
Optical Receiver Specifications
Parameter | Min. | Typ. | Max. | Unit | Notes |
Receiver Frequency Range | 1528.77 | 1547.72 | 1567.13 | Nm | |
Input Power Range | ‑12 | 0 | dBm | Signal power of the channel at the OSNR Penalty < 0.5dB | |
OSNR Sensitivity | 24 | 26 | dB/0.1nm | ||
Receiver Sensitivity | ‑20 | dBm | Input power needed to achieve post FEC BER < 1E‑15 when OSNR Tolerance > 26 dB/0.1nm | ||
Los Assert | ‑20 | ‑16 | dBm | ||
Los Hysteresis | 1.0 | 2.5 | dB | ||
CD Tolerance | 2400 | ps/nm | Tolerance to Chromatic Dispersion. | ||
PMD Tolerance | 10 | ps | Tolerance to PMD with < 0.5 dB penalty to OSNR sensitivity. | ||
Peak PDL Tolerance | 3.5 | dB | Tolerance to peak PDL with < 1.3 dB penalty to OSNR sensitivity when change in SOP is < =1 rad/ms. | ||
Tolerance to Change in SOP | 50 | ‑ | rad/ms | ||
Input Power Transient Tolerance | ‑2 | 2 | dB | Tolerance to change in input power with < 0.5 dB penalty to OSNR sensitivity. | |
Input Power Reading Accuracy | ‑2 | 2 | dB | ||
Optical Return Loss | ‑20 | dB | Optical reflectance at Rx connector input. | ||
Receiver Turn‑up Time from Cold Start | ‑ | 120 | s | From module reset, with valid optical input signal present. |
Loopback
The module support loopback functionality. The host loopback (Loopback ①) and the network loopback (Loopback ②) are shown at bellowing figure 2. For details on controlling the loopback mode, please refer to Reference [2]. In optional loopback, TXn is looped back to RXn, for example TX0+ to RX0+, on both host and media side.
Insertion, Extraction and Retention Force
The following table details the mechanical forces to insert, remove, and retain the module in a standard QSFP‑DD card cage.
Min. | Max. | Unit | Note | |
Insertion Force | 90 | N | ||
Extraction Force | 50 | N | ||
Retention Force | 90 | N |
EMI, EMC and ESD Specifications
The module is compliant with the requirements listed in the table below when installed in the host equipment.
Reference | Value | Unit | Note | |
ESD Immunity | IEC 61000‑4‑2 | 8 | kV | Contact Discharge |
15 | kV | Air Discharge | ||
ESD (HBM model) | JEDEC JESD22‑A114‑B | 1 | kV | High‑Speed Contacts |
2 | kV | Other pins | ||
EMC Immunity | IEC 61000‑4‑3 | |||
EMI Emission | FCC Class B |
Laser Safety
This is a Class 1 Laser Product according to IEC 60825‑1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).
Don’t directly look into the transmitter fiber connector at any time while the module is in operation.
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