Does this transceiver support link pass-through testing if our patch panels have multiple intermediate fusion splices over a 15km span?

Yes, as long as your total link insertion loss stays within the module’s optical power budget, it will maintain a stable 10Gbps link.

Does the 1370nm receiver wavelength exhibit higher vulnerability to micro-dust attenuation on the duplex LC interface compared to standard 1310nm single-mode optics transceiver?

At the physical layer, both wavelengths share an identical 9µm single-mode fiber core diameter, making their insertion loss sensitivity to microscopic contamination functionally equal. To maintain your link budget margins, we strictly recommend scoping and cleaning the ferrule tips with an optical click-cleaner immediately prior to insertion.

Does this transceiver support single-strand BiDi fiber infrastructure, or does it require two dedicated fibers?

This model requires a standard Duplex LC connection, meaning it utilizes two separate single-mode fiber strands (one for transmitting at 1370nm and one for receiving).

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Juniper EX-SFP-10GE-CWE37-20 Compatible LINK-PP 10G SFP+ CWDM 1370nm 20km Duplex LC DDM SMF Optical Transceiver Module

Name: Juniper EX-SFP-10GE-CWE37-20 Compatible LINK-PP 10G SFP+ CWDM 1370nm 20km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 221891
Price: 202.96 USD
Availability: InStock
Rating: 4.8 (12 reviews)

# 221891

Product: Juniper EX-SFP-10GE-CWE37-20 Compatible LINK-PP 10G SFP+ CWDM 1370nm 20km Duplex LC DDM SMF Optical Transceiver Module
SKU: 221891
P/N: LS-CW3710-20C
Price: $ 236
Stock: 144 in Stock
Sold: 1.1K
Product URL: https://www.l-p.com/products/491959.htm

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Manufacture: LINK-PP

P/N: LS-CW3710-20C

Compatible:: Cisco; LINK-PP; 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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Juniper EX-SFP-10GE-CWE37-20 Compatible LINK-PP 10G SFP+ Specifications

The EX-SFP-10GE-CWE37-20 anchors high-speed 10G optical networks as a hot-pluggable CWDM SFP+ transceiver, transmitting up to 20km over single-mode fiber (SMF) via LC duplex connectors at a 1370nm wavelength. Operating on a single +3.3V power supply, this module integrates digital diagnostic monitoring (DDM) to deliver continuous real-time system performance insights.

Juniper Part Number	EX-SFP-10GE-CWE37-20	Vendor Name	LINK-PP
Form Factor	SFP+	Max Data Rate	10.7Gbps
Wavelength	1370nm	Max Cable Distance	20km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
TX Power	-5 to +2dBm	RX Power	-16 to -1dBm
Receiver Sensitivity	<-15.5dBm	Receiver Overload	0.5dBm
Operating Temperature Range	0 to 70°C	Protocols	SFP+ MSA Compliant, CPRI, eCPRI, ITU-T G.652

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Q: Does this transceiver support link pass-through testing if our patch panels have multiple intermediate fusion splices over a 15km span? By F***e on 2026-02-10

A: Yes, as long as your total link insertion loss stays within the module’s optical power budget, it will maintain a stable 10Gbps link. By admin on 2026-02-11
Q: Does the 1370nm receiver wavelength exhibit higher vulnerability to micro-dust attenuation on the duplex LC interface compared to standard 1310nm single-mode optics transceiver? By G***n on 2025-06-21

A: At the physical layer, both wavelengths share an identical 9µm single-mode fiber core diameter, making their insertion loss sensitivity to microscopic contamination functionally equal. To maintain your link budget margins, we strictly recommend scoping and cleaning the ferrule tips with an optical click-cleaner immediately prior to insertion. By admin on 2025-06-22
Q: Does this transceiver support single-strand BiDi fiber infrastructure, or does it require two dedicated fibers? By E***e on 2025-05-11

A: This model requires a standard Duplex LC connection, meaning it utilizes two separate single-mode fiber strands (one for transmitting at 1370nm and one for receiving). By admin on 2025-05-12

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T***e

Nepal

Verified Purchase

5 .0

2026-04-13

High-performance storage replication over 18km single-mode fiber. We migrated our disaster recovery site to a new facility exactly 18km away from our primary data center. We utilized these 10G CWDM 1370nm transceivers to link our primary SAN to the backup replication target. Despite pushing close to the 20km maximum rating on a standard single-mode fiber path, we have experienced absolutely zero frame errors, sync drops, or link flapping. The data throughput is a steady, unthrottled 10Gbps. Couldn't have asked for a better, more cost-effective replication link setup.

166 Helpful vote Comments

B***r

Spain

Verified Purchase

5 .0

2026-04-08

Best budget-friendly 10G CWDM SFP+ 20km transceivers on the market right now, hands down.

59 Helpful vote Comments

X***e

Bangladesh

Verified Purchase

5 .0

2026-03-17

Works great, but make sure your Mux matches 1370nm. The product description is clear, but one of our junior installers accidentally tried to patch this into a 1310nm channel on our CWDM Mux. Obviously, the link didn't come up until we moved it to the correct 1370nm port. Excellent 20km optical module, just verify your wavelengths!

39 Helpful vote Comments

R***y

Libyan Arab Jamahiriya

Verified Purchase

5 .0

2026-02-03

Perfect solution for expanding fiber capacity in municipal networks. Our municipal WAN was running out of dark fiber pairs between the city hall and the public safety building. Instead of embarking on a costly trenching project, we deployed a passive CWDM system utilizing these 10Gbps 1370nm SFP+ optics. The 20km range provided a massive optical budget safety margin over our 14km actual run distance. The transceivers fit perfectly into our standard SFP+ ports and deliver immediate full-duplex throughput.

89 Helpful vote Comments

D***n

Hong Kong

Verified Purchase

5 .0

2026-01-29

Duplex LC connector snapped in cleanly. No wiggle, solid mechanical latching.

42 Helpful vote Comments

V***n

Maldives

Verified Purchase

4 .0

2026-01-22

Great transceivers, but shipping took an extra day. The LS-CW3710-20C 10G modules themselves work perfectly in our switches — recognized immediately and DDM is fully functional. However, the express courier delayed the delivery by 24 hours, which pushed our scheduled maintenance window back slightly. Product is 5 stars, shipping is 3 stars.

15 Helpful vote Comments

M***y

Belarus

Verified Purchase

5 .0

2026-01-18

Great value 10G optical module. If you are searching for reliable 10G 1370nm CWDM transceivers that won't break the enterprise budget, the LS-CW3710-20C is a phenomenal option. Will definitely buy more for our upcoming phase 2 expansion.

36 Helpful vote Comments

W***y

Philippines

Verified Purchase

4 .0

2025-11-27

Slightly delayed tracking info update. The sales team was helpful, but the tracking number didn't update in the system until two days after shipment. Had me worried our network upgrade timeline would slip. Thankfully, the package arrived right on schedule and the 10G SFP+ CWDM modules are working beautifully.

24 Helpful vote Comments

E***x

India

Verified Purchase

5 .0

2025-08-29

Passed all our 10GBASE-CWDM bit error rate tests. Zero frames dropped so far. Let's go!

27 Helpful vote Comments

C***t

Sweden

Verified Purchase

5 .0

2025-05-02

DDM telemetry is spot on. Real-time Rx/Tx power readings match our optical power meter perfectly.

106 Helpful vote Comments

G***l

Indonesia

Verified Purchase

5 .0

2025-04-26

Great addition to our ISP cell backhaul testing rig. We needed a reliable 1370nm CWDM SFP+ module to test channel segregation in the lab. The DOM functionality is fully operational, making it super easy to monitor signal degradation over simulated long runs.

95 Helpful vote Comments

S***s

Malaysia

Verified Purchase

5 .0

2025-03-06

Managing a large-scale enterprise network means you spend a lot of time troubleshooting physical layer optical issues. These 1370nm SFP+ transceivers have noticeably simplified our routine maintenance. Because the DDM values are completely accurate, our automated scripts can poll the switches via API and immediately flag if any fiber link drops past the safe Rx threshold. The 20km single-mode fiber specification provides an excellent cushion for link degradation over time. Truly a "set-and-forget" network hardware component.

159 Helpful vote Comments