We already have 1470nm, 1510nm, 1530nm, and 1570nm channels running on our passive CWDM Mux/Demux. Can we plug this 1550nm module straight into the open channel slot?

Yes, absolutely. 1550nm is a standard channel on the ITU-T G.694.2 CWDM grid with a 20nm channel spacing. As long as your Mux/Demux filter unit has a dedicated 1550nm port available (and you match it with a 1550nm CWDM transceiver at the remote end), the LS-CW5510-40C will integrate seamlessly without causing crosstalk or interfering with your existing wavelengths.

We have existing OS2 single-mode fiber and duplex LC patch cords. Is this module compatible with our cabling?

Yes. This module is designed for single-mode fiber transmission and uses a duplex LC optical interface. OS2 fiber is commonly used for long-distance 10G CWDM links and is suitable for this 40 km module.

Is the 0–70°C rating the ambient temperature or the module case temperature?

The stated specification is the operating case temperature of the module. Since internal switch heat and airflow can make the module case warmer than the surrounding air, it is important to leave sufficient thermal margin in high-density equipment.

Our fiber route is 32km, with several splices and patch panels. Is the 40km distance enough?

The 40km rating is based on a standard optical link budget, not only the physical fiber length. Please include fiber attenuation, connector loss, splice loss, and CWDM MUX/DEMUX insertion loss when calculating the total link loss; this is the best way to confirm whether the link has enough margin.

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FS CW-SFP10G40-55 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module

Name: FS CW-SFP10G40-55 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 221937
Price: 220.16 USD
Availability: InStock
Rating: 4.9 (31 reviews)

# 221937

Product: FS CW-SFP10G40-55 Compatible LINK-PP 10G SFP+ CWDM 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
SKU: 221937
P/N: LS-CW5510-40C
Price: $ 256
Stock: 402 in Stock
Sold: 750
Product URL: https://www.l-p.com/products/495383.htm

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Manufacture: LINK-PP

P/N: LS-CW5510-40C

Compatible:: Cisco; LINK-PP; Alcatel-Lucent; Brocade; Ciena; Dell; FS; Generic; H3C; HPE; Juniper

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

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FS CW-SFP10G40-55 Compatible LINK-PP 10G SFP+ Specifications

CW-SFP10G40-55 employs a cooled EML transmitter and PIN receiver at a 1550nm CWDM wavelength, supporting extended 40 km SMF links through a duplex LC interface, and incorporates real-time DOM features to monitor module status and optical performance.

FS Part Number	CW-SFP10G40-55	Vendor Name	LINK-PP
Form Factor	SFP+	Max Data Rate	10.7Gbps
Wavelength	1550nm	Max Cable Distance	40km
Connector	Duplex LC	Media	SMF
Transmitter Type	EML	Receiver Type	PIN
TX Power	-1 to +5dBm	RX Power	-23 to -6dBm
Receiver Sensitivity	-16dBm	DOM Support	Yes
Operating Temperature Range	0 to 70°C	Protocols	SFP+ MSA Compliant, SFF 8472,SFF 8431,802.3ae, ITU-T

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Q: We already have 1470nm, 1510nm, 1530nm, and 1570nm channels running on our passive CWDM Mux/Demux. Can we plug this 1550nm module straight into the open channel slot? By Q***d on 2026-04-01

A: Yes, absolutely. 1550nm is a standard channel on the ITU-T G.694.2 CWDM grid with a 20nm channel spacing. As long as your Mux/Demux filter unit has a dedicated 1550nm port available (and you match it with a 1550nm CWDM transceiver at the remote end), the LS-CW5510-40C will integrate seamlessly without causing crosstalk or interfering with your existing wavelengths. By admin on 2026-04-02
Q: We have existing OS2 single-mode fiber and duplex LC patch cords. Is this module compatible with our cabling? By O***n on 2026-01-09

A: Yes. This module is designed for single-mode fiber transmission and uses a duplex LC optical interface. OS2 fiber is commonly used for long-distance 10G CWDM links and is suitable for this 40 km module. By admin on 2026-01-10
Q: Is the 0–70°C rating the ambient temperature or the module case temperature? By N***s on 2025-10-11

A: The stated specification is the operating case temperature of the module. Since internal switch heat and airflow can make the module case warmer than the surrounding air, it is important to leave sufficient thermal margin in high-density equipment. By admin on 2025-10-12
Q: Our fiber route is 32km, with several splices and patch panels. Is the 40km distance enough? By P***y on 2025-08-18

A: The 40km rating is based on a standard optical link budget, not only the physical fiber length. Please include fiber attenuation, connector loss, splice loss, and CWDM MUX/DEMUX insertion loss when calculating the total link loss; this is the best way to confirm whether the link has enough margin. By admin on 2025-08-19

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A***r

Turkey

Verified Purchase

5 .0

2026-04-13

Ordered these for a small data center expansion where we needed 10GbE over existing SMF. The duplex LC CWDM optics transceivers were individually protected, installed without issue, and showed stable optical power levels after burn-in.

87 Helpful vote Comments

M***r

Bangladesh

Verified Purchase

5 .0

2026-04-08

This 10G SFP+ 1550nm CWDM module was installed for an indoor backhaul aggregation handoff over Duplex LC single-mode fiber. We specifically wanted CWDM optics rather than a generic short-reach module because the route had a longer patch-panel path and planned CWDM growth. The reported TX power range and receiver monitoring gave our NOC enough information to baseline the circuit. For commercial indoor cabinets operating within 0–70°C, it has been a straightforward, cost-effective choice.

139 Helpful vote Comments

J***n

Lithuania

Verified Purchase

4 .0

2026-03-31

Performance has been good on our 40km SMF test path, and the module feels like good value for routine enterprise deployments. I would just like more outer-box padding for small quantities.

16 Helpful vote Comments

N***s

Macao

Verified Purchase

4 .0

2026-02-16

Reliable 10GbE CWDM performance and fair value for a 1550nm 40km single-mode module. We would prefer more individual box cushioning for overseas bulk shipments, but the optics themselves arrived functional and tested well.

21 Helpful vote Comments

A***h

Finland

Verified Purchase

5 .0

2026-02-07

Great value for a 1550nm CWDM 10G SFP+ long-reach optical module.

74 Helpful vote Comments

C***n

Israel

Verified Purchase

5 .0

2025-12-14

We deployed several 1550nm CWDM SFP+ modules in a regional fiber aggregation project. Link establishment was fast, the EML CWDM optics stayed stable, and the DOM data was useful during commissioning.

78 Helpful vote Comments

L***t

Romania

Verified Purchase

5 .0

2025-11-26

Real-time optical Tx/Rx power readings match our optical power meter within ±0.2dBm.

60 Helpful vote Comments

L***e

Maldives

Verified Purchase

4 .0

2025-11-02

Modules initialize fast and maintain stable optical signal over single-mode fiber infrastructure. Delivery took an extra day due to local courier clearance, but this 10G CWDM module quality is top tier.

67 Helpful vote Comments

H***n

Indonesia

Verified Purchase

5 .0

2025-10-22

Solid 1550nm 10G CWDM SFP+ modules for our inter-building fiber link.

68 Helpful vote Comments

F***s

Libyan Arab Jamahiriya

Verified Purchase

4 .0

2025-09-08

Good price-to-performance for a commercial-grade 1550nm CWDM transceiver. We tested the optical levels before delivery to our customer; everything passed, though the shipping carton arrived a little scuffed.

25 Helpful vote Comments

O***n

Japan

Verified Purchase

5 .0

2025-08-21

For a phased network expansion, we needed 1550nm 10G CWDM optics that could be deployed in batches without adding complexity for the operations team. These modules arrived ready for standard SFP+ installation, and our technicians could verify TX/RX optical information from the equipment during acceptance checks. The 40km single-mode fiber capability gives us flexibility for future remote-site links, even though our current runs are shorter. Overall, it is a practical optical module for indoor telecom rooms, equipment racks, and enterprise fiber infrastructure.

122 Helpful vote Comments

R***n

Nepal

Verified Purchase

5 .0

2025-06-08

We deployed the LS-CW5510-40C CWDM module on a 10GbE campus backbone carrying virtualization, voice, and security traffic between buildings. Our single-mode route is well below the 40km maximum, but we selected the 1550nm CWDM optic to align with the existing wavelength plan. DOM was available immediately for checking transmit power, receive power, module temperature, and supply status during turn-up. After several weeks of normal traffic, the link has remained stable with no unexpected errors.

122 Helpful vote Comments

G***u

Australia

Verified Purchase

5 .0

2025-04-10

No complaints out of me... keep up the good work LINK-PP.

68 Helpful vote Comments

N***t

Poland

Verified Purchase

5 .0

2025-04-07

Plugged in, linked at 10Gbps, and diagnostics looked normal.

54 Helpful vote Comments

D***h

Ireland

Verified Purchase

5 .0

2025-03-25

This 40km CWDM 10G SFP+ module worked well for our remote office uplink. We checked TX and RX values through the switch diagnostics and had enough visibility to document the handoff properly.

92 Helpful vote Comments

R***n

Iran, Islamic Republic of

Verified Purchase

5 .0

2025-03-12

Our requirement was to carry 10G traffic across a leased dark-fiber route while preserving capacity for other CWDM wavelengths. This LS-CW5510-40C 1550nm SFP module fit the channel plan correctly and gave us the long-reach margin needed for the route. During commissioning, we used the module’s DDM information to verify optical conditions at both endpoints instead of relying only on link status. That saved time when documenting the circuit for handover.

146 Helpful vote Comments

V***n

Australia

Verified Purchase

5 .0

2025-01-24

Very satisfied with customer service.

49 Helpful vote Comments

M***l

United States

Verified Purchase

5 .0

2024-12-31

Is great i have the product and works perfectly i am satisfied with the product the deliver was very well

59 Helpful vote Comments

S***k

Israel

Verified Purchase

5 .0

2024-11-29

I chose l-p.com because of its Fast delivery and cheap price. Of course, it didn't let me down after receiving the goods.

29 Helpful vote Comments

A***i

United States

Verified Purchase

5 .0

2024-09-29

Product works as described. I have done business with them all in the past and have always had successful outcomes.

42 Helpful vote Comments

M***n

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2024-09-20

Great item good price quick shipping. Been a customer in the past and will in the future.

66 Helpful vote Comments

B***i

Lithuania

Verified Purchase

5 .0

2024-09-12

Items delivered on time and buying experience was smooth and seamless.

77 Helpful vote Comments

G***f

United States

Verified Purchase

5 .0

2024-08-30

Always friendly and reliable.

28 Helpful vote Comments

A***a

United States

Verified Purchase

5 .0

2024-08-22

Excellent service. 10/25/40G Transceiver Modules arrived Faster than expected, appropriately packaged, and have significantly improved data transfer speed.

56 Helpful vote Comments

S***v

United States

Verified Purchase

5 .0

2024-06-12

I have received the order, and your shipping time is out of expected. And the 10/25/40G Transceiver Modules are functioning just as expected. we have always been satisfied with our equipment from you.

17 Helpful vote Comments

N***z

Hong Kong

Verified Purchase

5 .0

2024-05-20

I checked out l-p.com references on several forums and it had nothing but good reviews.

75 Helpful vote Comments

J***a

United States

Verified Purchase

5 .0

2024-05-16

Excellent, Fast service. I will definitely order from there again.

56 Helpful vote Comments

B***o

Romania

Verified Purchase

5 .0

2023-10-21

Hassle Free with quality merchandise.

65 Helpful vote Comments

C***l

Taiwan, Province of China

Verified Purchase

5 .0

2023-09-08

Your web site is easy to understand and get around

31 Helpful vote Comments

B***o

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2023-08-27

Great quality, price and easy to navigate website.

51 Helpful vote Comments

I***i

Philippines

Verified Purchase

5 .0

2023-04-03

The 10/25/40G Transceiver Modules arrived on time with good packaging. And it was exactly as expected. Works perfectly and no issues. Everything is great and I will definitely use l-p.com again!

40 Helpful vote Comments