Can our network management system track real-time optical power and transmitter bias current on this 1310nm channel using digital diagnostic monitoring?

Yes, the module features full SFF-8472 compliant DDM support over the standard 2-wire serial interface. Your monitoring tools can poll calibrated real-time telemetry, including operating temperature, supply voltage, laser bias current, TX optical power, and RX optical power to monitor the status of links spanning up to 80km.

Our telco PoP rack maintains an ambient temperature around 28°C to 35°C. Is this LS-CW311G-80C CWDM module safe from thermal-induced wavelength drift across long-haul 80km runs?

Yes. This module is specified for a commercial case temperature range (0°C to +70°C). At an ambient of 35°C, the internal case temperature will remain within this limit (though not “well below”), and the DFB laser’s center wavelength is guaranteed to stay within 1310 ± 6.5nm across the entire operating temperature range per design. This ensures stable transmission through the CWDM passband without adjacent-channel crosstalk under normal operating conditions.

What type of fiber cable does this 1310nm CWDM module require, and can it support a real-world 60km to 70km run through passive CWDM filters?

This module is designed for standard single-mode fiber with a duplex LC connector. An actual 60km to 70km link is generally feasible thanks to its high-power DFB laser and sensitive PIN receiver. However, because real-world performance depends on total fiber attenuation, splice quality, and the insertion loss of your CWDM MUX/DEMUX units, we always recommend calculating your total channel loss before final deployment.

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FS CW-SFP1G80-31 Compatible LINK-PP 1G SFP CWDM 1310nm 80km Duplex LC DDM SMF Optical Transceiver Module

Name: FS CW-SFP1G80-31 Compatible LINK-PP 1G SFP CWDM 1310nm 80km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 224960
Price: 41.28 USD
Availability: InStock
Rating: 4.9 (15 reviews)

Product: FS CW-SFP1G80-31 Compatible LINK-PP 1G SFP CWDM 1310nm 80km Duplex LC DDM SMF Optical Transceiver Module
SKU: 224960
P/N: LS-CW311G-80C
Price: $ 48
Stock: 299 in Stock
Sold: 587
Product URL: https://www.l-p.com/products/497627.htm

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15 Reviews

3 Questions

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$ 48

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Manufacture: LINK-PP P/N: LS-CW311G-80C SKU: 224960

Compatible:: Cisco; LINK-PP; Arista; Brocade; Ciena; Dell; Extreme; FS; Generic; Juniper; Netgear

Wavelength:: 1270nm; 1310nm; 1330nm; 1350nm

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FS CW-SFP1G80-31 Compatible LINK-PP 1G SFP Specifications

CW-SFP1G80-31 SFP module achieves 1.25Gbps line rates and 80km SMF transmission at the 1310nm CWDM grid, using a DFB laser and PIN detector with matched bandwidth. Real-time DDM functionality reports bias current, temperature, supply voltage, and optical power levels on demand, enabling proactive link supervision. The module’s wavelength accuracy and overall optical stability are maintained within defined limits across the full 0 - 70°C ambient range.

FS Part Number	CW-SFP1G80-31	Vendor Name	LINK-PP
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	1310nm	Max Cable Distance	80km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-1 to +4dBm	RX Power	-26 to -1dBm
Receiver Sensitivity	-26dBm	Receiver Overload	-1dBm
EMC (Electromagnetic Compatibility)	Supported	DDM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	SFP MSA、SFF-8472

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Q: Can our network management system track real-time optical power and transmitter bias current on this 1310nm channel using digital diagnostic monitoring? By D***s on 2026-02-02

A: Yes, the module features full SFF-8472 compliant DDM support over the standard 2-wire serial interface. Your monitoring tools can poll calibrated real-time telemetry, including operating temperature, supply voltage, laser bias current, TX optical power, and RX optical power to monitor the status of links spanning up to 80km. By admin on 2026-02-03
Q: Our telco PoP rack maintains an ambient temperature around 28°C to 35°C. Is this LS-CW311G-80C CWDM module safe from thermal-induced wavelength drift across long-haul 80km runs? By E***r on 2025-11-17

A: Yes. This module is specified for a commercial case temperature range (0°C to +70°C). At an ambient of 35°C, the internal case temperature will remain within this limit (though not “well below”), and the DFB laser’s center wavelength is guaranteed to stay within 1310 ± 6.5nm across the entire operating temperature range per design. This ensures stable transmission through the CWDM passband without adjacent-channel crosstalk under normal operating conditions. By admin on 2025-11-18
Q: What type of fiber cable does this 1310nm CWDM module require, and can it support a real-world 60km to 70km run through passive CWDM filters? By Y***y on 2025-04-21

A: This module is designed for standard single-mode fiber with a duplex LC connector. An actual 60km to 70km link is generally feasible thanks to its high-power DFB laser and sensitive PIN receiver. However, because real-world performance depends on total fiber attenuation, splice quality, and the insertion loss of your CWDM MUX/DEMUX units, we always recommend calculating your total channel loss before final deployment. By admin on 2025-04-22

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H***e

Brazil

Verified Purchase

5 .0

2026-06-14

Reliable 80km SMF performance, no packet loss.

55 Helpful vote Comments

P***h

Belgium

Verified Purchase

5 .0

2026-06-02

The wavelength accuracy on the 1310nm band matches ITU-T grid specifications nicely. Channel isolation on our 8-channel Mux is clean with zero crosstalk detected on neighboring optical channels.

65 Helpful vote Comments

X***y

Finland

Verified Purchase

5 .0

2026-05-02

We used these in an outdoor cabinet for a small metro node, connecting to a central office over long-distance SMF. The Duplex LC interface mated cleanly with our patch cords, and the 80km spec gave us comfortable margin after accounting for connector and splice loss. Over two weeks, we monitored DDM data and saw no drift in output or wavelength. The commercial temp range was sufficient inside our ventilated enclosure, and the modules’ low power draw helped with thermal management.

129 Helpful vote Comments

K***t

Malaysia

Verified Purchase

5 .0

2026-04-05

Tested these 1G CWDM modules inside our carrier-neutral colocation room. Hot-swapping was completely seamless and caused zero voltage drops or link flaps on adjacent ports. Good thermal dissipation even in fully populated rack switches.

87 Helpful vote Comments

Q***t

Canada

Verified Purchase

5 .0

2026-02-03

Clean eye pattern, stable TX power, no surprises.

47 Helpful vote Comments

F***y

Italy

Verified Purchase

5 .0

2025-10-08

For a campus NAS build with 1G fiber uplinks, these SFP modules are a no-brainer. The DDM support lets us watch optical power in real time, and the 80km spec gives us headroom even on shorter indoor runs.

93 Helpful vote Comments

E***n

Ireland

Verified Purchase

4 .0

2025-09-17

Great 80km CWDM SFPs for our campus fiber, but the courier missed the first delivery attempt and rescheduled. Product itself is flawless; just a shipping hiccup.

34 Helpful vote Comments

J***n

India

Verified Purchase

5 .0

2025-08-09

Solid optical budget for our regional campus link, and MSA compliance is 100% on point.

99 Helpful vote Comments

Y***n

Thailand

Verified Purchase

5 .0

2025-07-25

We replaced a few failing modules with these and immediately saw cleaner eye diagrams on the scope. The CWDM wavelength is accurate, and the DDM alarms trigger correctly during our fiber bend tests.

72 Helpful vote Comments

N***s

Singapore

Verified Purchase

5 .0

2025-05-19

Running these CWDM 1G SFP modules in a small data center interconnect over dark fiber. The 1.25Gbps rate is perfect for our legacy gear, and the Duplex LC SMF interface keeps cabling tidy. No errors after 48 hours of stress testing.

91 Helpful vote Comments

V***d

Republic of Korea

Verified Purchase

5 .0

2025-01-15

Laser output power is rock steady, and duplex LC seated firmly into the patch panel.

83 Helpful vote Comments

S***g

Spain

Verified Purchase

5 .0

2024-12-30

Swapped out older modules with these LS-CW311G-80C SFP modules on a 1G CWDM Mux/Demux chain. Wavelength alignment is spot-on, and we’re seeing consistent receiver sensitivity around -26dBm on long spans. No need to re-tune the Mux.

121 Helpful vote Comments

D***y

Australia

Verified Purchase

5 .0

2024-11-22

1.25Gbps CWDM link up in minutes, happy with it.

82 Helpful vote Comments

H***k

Russian Federation

Verified Purchase

5 .0

2024-11-02

Nice balance of price and performance for 80km CWDM links. The modules report accurate temperature and voltage via DDM, which helps us catch any marginal fibers before they become a problem.

88 Helpful vote Comments

M***h

South Africa

Verified Purchase

5 .0

2024-10-28

We ordered a batch of these LS-CW311G-80C transceivers to connect our downtown branch to our suburban disaster recovery site. Both ends locked into the CWDM MUX/DEMUX effortlessly over standard duplex LC single-mode fiber. The link has maintained zero CRC errors over the past month.

115 Helpful vote Comments