Description
ETSC’s OM3680SX200 is a parallel 400GE Quad Small Form Factor Pluggable double density (QSFP-DD) SR8 optical module designed for optical communication applications. The optical module uses a 4- level pulse amplitude modulation (PAM4) format. The optical module provides point-to-point 400 Gigabit Ethernet links over eight pairs of multimode fiber, with a reach of up to 100 m for OM4 (MMF) and 70 m for OM3 (MMF).
It is compliant with QSFP-DD MSA standard and IEEE 802.3cm 400GBASE-SR8 standard and IEEE 802.3bs 400GAUI-8 standard. Digital diagnostics functions are available via the I2C interface, as specified by the QSFP-DD MSA.
Features
- QSFP-DD MSA compliant
- QSFP-DD CMIS4.0 Management interface compliant
- IEEE 802.3cm 400GBASE-SR8 standard compliant
- IEEE 802.3bs 400GAUI-8 standard compliant
- Digital diagnostic functions
- 8 channels full-duplex transceiver module
- 425 Gbit/s aggregate bit rate
- Maximum link length of 70 m OM3, 100 m OM4 with FEC
- Single MPO-16/APC receptacle
- Maximum power dissipation < 10 W
- Operating case temperature range 0 to 70℃
- Single 3.3 V power supply
- RoHS 2.0 compliant
Applications
- 400G Ethernet
- Data center network
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 | Typ | Max | Unit | Notes |
| Maximum supply voltage | Vcc | -0.3 | 3.3 | 3.6 | V | |
| Storage temperature | Ts | -40 | 85 | ℃ | ||
| Relative humidity | RH | 5 | 85 | % | 1 | |
| Damage threshold, each lane | THd | 5 | dBm |
Notes
- Non-condensing.
Operating Environments
Electrical and optical characteristics below are defined under this operating environment, unless otherwise specified.
| Parameter | Symbol | Min | Typ | Max | Unit | Notes |
| Supply voltage | Vcc | 3.135 | 3.3 | 3.465 | V | |
| Case temperature | Tc | 0 | 70 | ℃ | ||
| Data rate, each lane | 26.5625 | GBd | ||||
| Data rate accuracy | -100 | 100 | ppm | |||
| Modulation format | PAM4 | |||||
| Link distance with OM3 MMF | 70 | m | ||||
| Link distance with OM4 MMF | 100 | m | ||||
| Link distance with OM5 MMF | 100 | m | ||||
Notes
- Initialization Flows: The Host Initialization Flows of CMIS Rev4.0 Standard Appendix C are recommended.
Electrical Characteristics
| Parameter | Symbol | Min | Typ | Max | Unit | Notes |
| Power dissipation | 9 | 10 | W | |||
| Steady state current | Icc | 3189 | mA | 1 | ||
| Instantaneous peak current | 4000 | mA | ||||
| Sustained peak current | 3300 | mA | ||||
| Module-to-Host electrical specifications at TP4 (module output) | ||||||
| Differential voltage pk-pk | Vpp | 900 | mV | |||
| Common mode voltage | Vcm | -350 | 2850 | mV | 2 | |
| AC common-mode output voltage (RMS) | 17.5 | mV | ||||
| Parameter | Symbol | Min | Typ | Max | Unit | Notes |
| Transition time | Trise/Tfall | 9.5 | ps | 20%~80% | ||
| Differential termination resistance mismatch | 10 | % | ||||
| Near-end ESMW (eye symmetry mask width) | 0.265 | UI | ||||
| Near-end eye height, differential | 70 | mV | ||||
| Far-end ESMW (eye symmetry mask width) | 0.20 | UI | ||||
| Far-end eye height, differential | 30 | mV | ||||
| Far-end pre-cursor ISI ratio | -4.5 | 2.5 | % | |||
| Differential output return loss | IEEE 802.3-2018 Equation (83E-2) | dB | ||||
| Common to differential mode con- version return loss | IEEE 802.3-2018 Equation (83E-3) | dB | ||||
| Host-to-Module electrical specifications (module input) | ||||||
| Differential termination resistance mismatch | 10 | % | ||||
| Overload differential voltage pk-pk | Vpp | 900 | mV | TP1a | ||
| DC common mode voltage | Vcm | -350 | 2850 | mV | TP1 | |
| Single-ended voltage tolerance | -0.4 | 3.3 | V | TP1a | ||
| Module stressed input test | IEEE 802.3bs 120E.3.4.1 | TP1a | ||||
| Differential input return loss | IEEE 802.3-2018 Equation (83E-5) | dB | TP1 | |||
| Differential to common mode input return loss | IEEE 802.3-2018 Equation (83E-6) | dB | TP1 | |||
Notes
- The module must stay within its declared power class.
- DC common mode voltage is generated by the host. Specification includes effects of ground offset voltage.
Optical Characteristics
| Parameter | Symbol | Min | Typ | Max | Unit | Notes |
| Center wavelength | λc | 840 | 868 | nm | ||
| Host-to-Module electrical specifications (module input) | ||||||
| RMS spectral width | 0.65 | nm | ||||
| Average launch power, each lane | PAVG | -6.5 | 4 | dBm | ||
| Outer optical modulation amplitude (OMA outer), each lane | POMA | -4.5 | 3 | dBm | ||
| Launch power in OMA outer minus TDECQ, each lane | -5.9 | dBm | ||||
| Transmitter and dispersion eye clo- sure for PAM4, each lane | TDECQ | 4.5 | dB | |||
| TDECQ – 10log10 (Ceq), each lane | 4.5 | dB | ||||
| Extinction ratio, each lane | ER | 3 | dB | |||
| Transmitter transition time, each lane | 34 | ps | ||||
| Average launch power of OFF transmitter, each lane | POFF | -30 | dBm | |||
| RIN12OMA | -128 | dB/Hz | ||||
| Optical return loss tolerance | 12 | dB | ||||
| Encircled flux | ≥ 86% at 19 um ≤ 30% at 4.5 um | Encircled flux | ||||
| Receiver | ||||||
| Average receiver power, each lane | -8.4 | 4 | dBm | |||
| Receiver power, each lane (OMA) | 3 | dBm | ||||
| Damage threshold, each lane | THd | 5 | dBm | |||
| Receiver reflectance | -12 | dB | ||||
| LOS assert | LosA | -24.6 | dBm | |||
| LOS de-assert | LosD | -8 | dBm | |||
| LOS hysteresis | LosH | 0.5 | dB | |||
| Receiver sensitivity (OMA outer), each lane | Sen | Max (– 6.5,SE CQ –7.9) | dB | |||
| Stressed receiver sensitivity (OMA) , each lane | SRS | -3.4 | dBm | |||
| Conditions of stressed receiver sensitivity test | ||||||
| Stressed eye closure for PAM4, lane under test | SECQ | 4.5 | dB | |||
| SECQ – 10log10 (Ceq), lane under test | 4.5 | dB | ||||
| OMA outer of each aggressor lane | 3 | dBm | ||||
