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.

Breadcrumb: Home; Products; Optics Transceivers | SFP Modules; 1/2/4G Transceiver Modules; 1G CWDM/DWDM SFP; 203046

Click to open expanded view

LINK-PP LS-CW311G-80C 1G SFP CWDM 1310nm 80km Duplex LC DDM SMF Optical Transceiver Module

Name: LINK-PP LS-CW311G-80C 1G SFP CWDM 1310nm 80km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 203046
Price: 41.28 USD
Availability: InStock
Rating: 4.9 (28 reviews)

Product: LINK-PP LS-CW311G-80C 1G SFP CWDM 1310nm 80km Duplex LC DDM SMF Optical Transceiver Module
SKU: 203046
P/N: LS-CW311G-80C
Price: $ 48
Stock: 199 in Stock
Sold: 501
Product URL: https://www.l-p.com/products/492512.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

28 Reviews

3 Questions

501 Sold

$ 48

Free shipping over $600, If you need a more favorable price, please contact us directly.

Qty (pcs) :

Unit Price :

$ 48

100

$ 45.6

1000

$ 44.16

3000

$ 42.72

6000

$ 41.28

Manufacture: LINK-PP P/N: LS-CW311G-80C SKU: 203046

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

Wavelength:: 1270nm; 1290nm; 1310nm; 1330nm; 1350nm; 1370nm; 1390nm; 1410nm; 1430nm; 1450nm; 1470nm; 1490nm; 1510nm; 1530nm; 1550nm; 1570nm; 1590nm; 1610nm

Shipping:

To Be Negotiated

Free Shipping

Can't deliver

to United States via {{now_chooseship?now_chooseship.name:''}}

Estimated delivery time : {{now_chooseship?now_chooseship.datemin:''}}-{{now_chooseship?now_chooseship.datemax:''}} days.

5-Year Warranty 30-Day Returns 30-Day Exchange

Stock:

{{parseInt(detail_data.left_num) ? detail_data.left_num +' in Stock' :detail_data.zeroStockOrder==0?'Out of Stock':'Available'}} .

Quantity:

( Min. Order {{detail_data.prodInfo.minimum_ordered_quantity}} )

undeliverable

Total Price:

{{ detail_data.displayed_price.unit_prefix }} {{ detail_data.displayed_price.original_total_price }} ( {{ detail_data.displayed_price.rate_of_discount }}% OFF ) {{detail_data.displayed_price.ex_sell_type}}

Specifications

Specification
Matching Products
Download
Q&A
Customer Reviews

LINK-PP LS-CW311G-80C 1G SFP Specifications

LS-CW311G-80C 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.

LINK-PP Part Number	LS-CW311G-80C	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

Matching Products

Pictures

ID#

Description

Price

Stock

Add to Cart

Download

Product Drawing

PDF
LS-CWxx1G-80x.pdf

Questions & Answers
Ask a Question

No data

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

Customer Reviews
Write a Review

{{stardata.star}}

{{comment.count}} reviews
5 Stars

{{comment.star5}}%

4 Stars

{{comment.star4}}%

3 Stars

{{comment.star3}}%

2 Stars

{{comment.star2}}%

1 Star

{{comment.star1}}%

All Reviews ({{comment.star_num?comment.star_num:comment.count}})

All Reviews

5 stars only

4 stars only

3 stars only

2 stars only

1 star only
Reviews with Pictures ( {{comment.pic_comment}} )
See All Reviews

No data

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

O***r

Sweden

Verified Purchase

5 .0

2026-05-11

Deployed these 80km CWDM SFP modules for a metro access upgrade; all channels locked at 1310nm with expected TX/RX levels. DDM telemetry is clean, and our monitoring tools read temperature and power without hiccups. Good value for 80km CWDM runs.

108 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

B***d

Norway

Verified Purchase

5 .0

2026-03-21

We use these on point-to-point 1G CWDM links between buildings. The DFB CWDM transmitter is stable, and the -1 to +4dBm TX power range fits our design margins nicely. Installation was straightforward with standard duplex LC patch cables.

102 Helpful vote Comments

I***e

Philippines

Verified Purchase

5 .0

2026-02-16

Tested on a 60km span with some splice losses; RX power stayed comfortably above sensitivity. The SFP form factor and low power draw make these easy to slot into dense switches.

100 Helpful vote Comments

B***e

Turkey

Verified Purchase

4 .0

2026-02-08

Performance is excellent on our 50km CWDM link, but one module arrived with a slightly loose dust cap. Optics are fine, DDM works, just a small packaging thing.

23 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

A***k

Netherlands

Verified Purchase

5 .0

2025-12-04

Decent receiver sensitivity for an 80km link budget at this price tier.

62 Helpful vote Comments

C***s

France

Verified Purchase

5 .0

2025-11-18

This 1310nm CWDM SFP works flawlessly in our aggregation ring.

59 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

G***n

Austria

Verified Purchase

5 .0

2025-08-31

We ran a 7-day validation on a long-haul 1G CWDM link using two LS-CW311G-80C modules. The 1310nm wavelength stayed stable, and DDM telemetry integrated cleanly with our monitoring system. No packet loss or errors under heavy load, and the 80km SMF reach gave us comfortable margin. For commercial 0-70°C deployments, these are reliable and easy to manage.

136 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

K***l

Romania

Verified Purchase

5 .0

2025-04-07

For a legacy 1G CWDM upgrade, we replaced older SFPs with LS-CW311G-80C CWDM modules across a multi-channel Mux. Each 1310nm channel aligned with the CWDM grid, and we could mix these with other CWDM wavelengths without retuning. The DDM support let us set proactive alarms for RX power and temperature, which reduced our MTTR on fiber issues. After a month of operation, we’ve had no RMA requests, and the optical performance matches the datasheet. Great fit for cost-sensitive 80km SMF deployments.

143 Helpful vote Comments

D***n

Indonesia

Verified Purchase

5 .0

2025-02-28

Used two units for offsite replication between enterprise storage nodes over dark fiber. Link latency is stable, throughput hits line rate cleanly, and the locking latch clicks firmly into the cage. Solid purchase.

114 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

U***m

New Zealand

Verified Purchase

5 .0

2024-12-12

Operating temperature has stayed steady around 38°C inside our standard air-conditioned server room racks. Power consumption is low and the 1.25G Ethernet transport has been rock solid since day one.

76 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

G***e

Poland

Verified Purchase

5 .0

2024-11-14

24 units across six sites for a private LTE backhaul upgrade. Each 1G CWDM pair was tested end-to-end with Duplex LC patch cords and standard single-mode fiber. All channels came up with healthy link margin, and the modules showed stable output with no flapping. We also verified behavior in a noisy cabinet — no EMI issues, and they passed our 48-hour temperature soak.

111 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

L***s

Mexico

Verified Purchase

5 .0

2024-10-15

Got our long-distance Gigabit connection running at 1310nm without a single packet error.

107 Helpful vote Comments

M***s

Ukraine

Verified Purchase

5 .0

2024-10-06

In our metropolitan aggregation network, we multiplex Gigabit Ethernet lines alongside other wavelengths over a single pair of SMF lines. The transmitter in this module maintains narrow spectral width and tight center wavelength tolerance, eliminating adjacent channel leakage into our adjacent CWDM passbands. Over a 64km dark fiber route with two patch hops, our received optical power sat safely at -21.8 dBm, well above the receiver sensitivity floor. Zero frame discards or link flap incidents recorded over 30 days of continuous live production traffic.

149 Helpful vote Comments