Cisco SFP-25G-SL Optical Module Sample Test Report

Cisco offers the SFP-25G-SL optical module, which supports 25G Ethernet transmission up to 30 m over multimode fiber. Moduletek Laboratory has tested samples of this product to help users further understand its performance indicators and real-world operation effect.

1. Product Description

The Cisco SFP-25G-SL optical module supports link lengths of 20 m (over OM3 multimode fiber) and 30 m (over OM4 multimode fiber). It requires the host port to enable RS-FEC (Reed-Solomon FEC) mode for normal operation. The official key parameters and physical appearance of the module are as follows:

Cisco SFP -25G- SL

The Cisco 25GBASE- SL Module supports a link length of 20/30m on OM3/4 MMF .

The Cisco SFP -25G- SL (Short Link ) module requlres RS - FEC on the host ports

Table 1 Key Parameters

Product	Max Power Consumption (W)	Transmit Power (dBm)*		Receive Power (dBm)*		Transmit and Receive Wavelength (nm)
		Maximum	Minimum	Maximum	Minimum
SFP -25G- SL	1.2	2.4	-8.4	2.4	-10.3	840 to 860

Physical appearance of CISCO SFP-25G-SL optical module

Figure 1 Physical Appearance

2. Module On-Board Identification

The SFP-25G-SL module was connected to a Cisco N9K-C93180YC-EX switch with a patch cord. The test results are as follows:

• The module established a normal LINK, and the port indicator lit up steadily.

• The switch correctly recognized the module information, including module type, vendor name, model number, serial number, transmission rate, and transmission distance.

• DOM (Digital Optical Monitoring) data was read normally, with all values within the threshold range and no alarms triggered.

• RS-FEC mode was enabled on the host port, meeting the module’s operating requirements.

Table 2 Optical Module Upload Recognition

Item	Information Read by Switch
LINK
Identification
DOM Data
FEC Mode

3. Key Parameter Testing

Performance indicators of the SFP-25G-SL sample module were tested on a test bench with the module enclosure temperature stabilized at 45°C in the laboratory. The test results are as follows:

Table 3 Key Parameter

Parameters	Test Data	Unit	Remarks
Transmit Optical Power	-0.5	dBm
Receiving Sensitivity (without fiber)	-13.7	dBm	5E-5 BER
Receive Sensitivity (with 30m OM4 fiber)	-13.1	dBm	5E-5 BER
Power Consumption	0.731	W

Optical eye diagram testing of the sample module was conducted at an enclosure temperature of 45°C. The eye diagram templates and parameters are as follows: