NVIDIA/MELANOX company has model MMA2L20-AR optical module products, can support 25G Ethernet transmission 10KM in single-mode fiber, Moduletek Limited Laboratory of the product prototype test, to facilitate a further understanding of the product's performance indicators and the effect of the actual machine use.

1.Product Introduction

        MELLANOX MMA2L20-AR optical module supports 10KM link length on 25G standard single mode fiber (SMF) G.652. The official key parameter information and the physical appearance of the module are as follows:

Table 1 MELLANOX MMA2L20-AR Optical Module Official Description

  Ordering Part Number
  Description
  MMA2L2O-AR
  Optical transceiver,25GbE,25Gb/s,SFP28,LC-LC,1310nm,LR up to 10km
  Parameter
Min
Type
Max
Units
Notes
  Power Supply Voltage
3.135
3.3
3.465
V
---
  Power consumption
---
---
1.5
W
---
  Operating case temperature
0
---
70
---
  Link Distance with ITU-T G.652.D
0.002
---
10
km
---
  Average launch power
-7
---
2
dBm
---
  Receiver Sensitivity (OMA)
---
---
-12
dBm
1
  Stressed Receiver Sensitivity (OMA)
---
---
-9.5
dBm
2
  Notes:
  1.Hit ratio 5x10-5per sample.
  2.Measured with conformance test signal at receiver input for BER =5x10-5.

 

MELLANOX MMA2L20-AR Optical Module Physical Picture

Figure 1 MELLANOX MMA2L20-AR Optical Module Physical Picture

2.Module identification

        MMA2L20-AR module will be connected to the MELLANOX MCX4121A-ACAT card, access to the jumper, the module can be normal LINK, the port indicator lights up; module information can be recognized by the switch, such as the module type, model number, vendor name, serial number, wavelength, transmission distance, etc.; you can read the DOM data, and the DOM data are in the threshold range, no alarm phenomenon. Alarm phenomenon. The interface adapts to FC-FEC mode in auto FEC mode.

Table 2 MELLANOX MMA2L20-AR Optical Module Upstream Identification

Item  Server/network card reading information
LINK

Identify 

DOM data

3.Module key parameters test

        a. Laboratory module shell 45 ℃ conditions, the MMA2L20-AR sample module in the test version of the performance indicators are tested, the test results are as follows;

Table 3 MELLANOX MMA2L20-AR optical module performance indicators

  Parameter Test data Unit Remarks
  Transmit optical power -2.8 dBm  
  Receiving sensitivity (not over fiber) -17.5 dBm  5E-5 BER
  Receiving sensitivity (over 10km fiber) -17.6 dBm  5E-5 BER
  Power consumption 0.9 W  
 

         b. Sample module enclosure 45°C optical eye diagram test with the following eye diagram template and parameters:

MELLANOX MMA2L20-AR Optical Module Eye Diagrams

Figure 2 MELLANOX MMA2L20-AR Optical Module Eye Diagrams
 

Table 4 MELLANOX MMA2L20-AR light module eye diagram parameters

Temperature (℃)   Extinction ratio (dB)  P-P jitter (ps)  Rise time (ps)  Fall time (ps) Margin value (%)
45 4.51 12.6 16.44 19.32 11.5

        From the actual test situation, the key parameters of the module are in line with the official claims of MELLANOX.

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