Deployment of 5G services and cloud area brings new opportunities and technologies on the market.

Looking at the G deployment initial phase, we can see at the access level that legacy 10G and GE infrastructures are more and more replaced by 25G and 50G infrastructures

Today, 25GE/50GE optical modules are used to meet the requirements of initial 5G deployment. Going in this direction, it is obvious that 50GE deployment is the most cost-effective.

PAM4-based Optical Transceiver Technologies

The PAM4 (4 level Pulse Amplitude Modulation) encoding technology allows to double the current amount of information transmitted on a single lane when using a 50G PAM4-based optical transceiver. Indeed, the PAM4 DSP will encode 2x 25Gbps signal into a 25Gbaud (50Gbps) signal.

How does it work?

On the Tx side, the PAM4 encoding chip aggregates two 25Gbit/s NRZ signals into one 25GBaud PAM4 signal. The laser drive chip amplifies the PAM4 signal, and the 25Gbps laser converts the electrical signal into a 25GBaud (50Gbps) single-wavelength optical signal.

On the Rx side, this exactly the reverse mechanism and the PAM4 decoding chip converts the 25GBaud (50Gbps) signal into two 25Gbps NRZ signals.

The 50GE PAM4 optical transceiver uses the QSFP28 encapsulation mode, LC optical interfaces, and single-mode optical fibers. The transmission distance is 10km or 40km on dual or single fiber, and the maximum power consumption is 4.5W.

Skylane Optics 50G QSFP28 presentation

Skylane Optics propose the full range of 50G QSFP28 from 10km to 80km and for both dual fiber and single fiber installation.

Dual Fiber 50G QSFP28 LR (Q2C31010500F) & ER (Q2C31040500F)

Features

  • QSFP28 Multi-Source Agreement compliant
  • Hot pluggable QSFP28 footprint
  • Supports 125Gbps Data Rate
  • 2´5625Gbps Serial Electrical Interface (50GAUI-2)
  • Single LC Optical Interface
  • CWDM Transmitter
  • PIN Receiver for the LR and APD receiver for the ER
  • Built-in DSP / dual CDR
  • Up to 10km/40km Point-to-Point Transmission on Single Mode Fibre
  • Operating temperature range 0°C to 70°C
  • Power Dissipation < 3.5W for the LR and < 4.5W for the ER
  • Single +3.3V Power Supply

Single Fiber 50G QSFP28 LR (Q2B[23/32]010500D) & ER (Q2B[19/91]040500D)

Features

  • QSFP28 Multi-Source Agreement compliant
  • Hot pluggable QSFP28 footprint
  • Supports 125Gbps Data Rate
  • 2´5625Gbps Serial Electrical Interface (50GAUI-2)
  • Single LC Optical Interface
  • 1271/1331nm for LR and 1308/1294nm for ER on Transmitter side
  • 1331/1271nm PIN for LR 1294/1308nm APD for ER on Receiver side
  • Built-in DSP / dual CDR
  • Up to 10km/40km Point-to-Point Transmission on Single Mode Fibre
  • Operating temperature range 0°C to 70°C
  • Power Dissipation < 3.5W for the LR and < 4.5W for the ER
  • Single +3.3V Power Supply

Dual Fiber 50G QSFP28 ZR2 (Q282D080500F)

This part, compared to the other 50 QSFP28, do not use the PAM4 technology on the optical side. Indeed, here NRZ modulation is used, and the two transmitters (cooled 1310nm LAN-WDM lasers) are generating two optical 25Gbps output signals, which are multiplexed together at the optical output port. The two receivers are PIN Photodiodes which detect (after optical de-multiplexing) 2× 25Gbps optical input signals.

Features

  • QSFP28 Multi-Source Agreement compliant
  • Hot pluggable QSFP28 footprint
  • Supports 5625Gbps Data Rate
  • 2´78125Gbps Serial Electrical Interface
  • Single LC Optical Interface
  • 1310nm LAN-WDM Transmitters
  • PIN+SOA Receivers
  • Built-in dual CDR
  • Up to 80km Point-to-Point Transmission on Single Mode Fibre
  • Operating temperature range 0°C to 70°C
  • Power Dissipation < 5W
  • Single +3.3V Power Supply

 

 

 

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