Specification Review
Align category, shielding, cable fit, contact plating and application requirements.
Optic Fiber
40G QSFP+ LR4 Optical Transceiver 10km LC SMF Compatible with Finisar FTL4C1QE1L
40G QSFP+ LR4 optical transceiver designed for 40 Gigabit Ethernet over single-mode fiber (SMF). Supports transmission up to 10km with LC duplex connector, 1310nm wavelength, Digital Diagnostic Monitoring (DDM), and full compatibility with Finisar FTL4C1QE1L for enterprise, telecom, and data center applications.
SKU Variants
FINISAR QSFP-40G-LR4
Sign in or register to sync this inquiry list across devices.
Engineering reviewSpecification and application alignment
OEM / ODM optionsLabel, packaging and configuration support
Sample-based approvalConfirm critical details before production
Product Overview
Review the construction, options and application notes before requesting a sample or quotation.
| Item | Specification |
|---|---|
| Product Name | 40G QSFP+ LR4 Optical Transceiver |
| Model | FINISAR QSFP-40G-LR4 |
| Compatible Model | FTL4C1QE1L |
| Brand | Detwiler Tech / OEM / ODM |
| Product Type | Optical Transceiver Module |
| Form Factor | QSFP+ |
| Ethernet Standard | 40GBASE-LR4 |
| Data Rate | Up to 41.2Gbps |
| Fiber Type | Single Mode Fiber (SMF) |
| Connector | Duplex LC |
| Maximum Transmission Distance | 10km |
| Wavelength | 1310nm Band |
| Transmitter | 4 × DFB Laser |
| Receiver | PIN Photodiode |
| Digital Diagnostics | DDM / DOM Supported |
| Management Interface | I²C (QSFP+ MSA) |
| Operating Temperature | 15°C ~ +60°C |
| Supply Voltage | 3.3V |
| Compliance | IEEE 802.3ba, QSFP+ MSA, RoHS |
| Packaging | Individual Box / OEM Package |
| OEM/ODM | Supported |
| Option | Available Choices |
|---|---|
| Compatibility | Finisar Compatible, OEM Compatible |
| Packaging | Individual Box, OEM Custom Packaging |
| Label Printing | Detwiler Tech / OEM / ODM |
Product Description
Product Overview
The Detwiler Tech DT-QSFP-40G-LR4 is a high-performance 40G QSFP+ optical transceiver engineered for long-distance 40 Gigabit Ethernet transmission over single-mode fiber. Fully compatible with Finisar FTL4C1QE1L, it complies with IEEE 802.3ba 40GBASE-LR4 and QSFP+ MSA standards, making it an ideal solution for data centers, enterprise networks, telecom infrastructure, and cloud computing environments.
Equipped with 4 × DFB lasers, PIN receiver, Digital Diagnostic Monitoring (DDM/DOM), and a duplex LC interface, the module delivers reliable transmission up to 10km while maintaining excellent optical performance and interoperability.
Key Features
- 40GBASE-LR4 QSFP+ optical transceiver
- Fully compatible with Finisar FTL4C1QE1L
- Supports up to 41.2Gbps data transmission
- Transmission distance up to 10km over SMF
- Duplex LC optical interface
- 1310nm wavelength operation
- Digital Diagnostic Monitoring (DDM/DOM)
- QSFP+ MSA compliant
- IEEE 802.3ba compliant
- Low power consumption and hot-pluggable design
- RoHS compliant
Applications
- Data Centers
- Enterprise Networks
- Cloud Computing Infrastructure
- 40G Ethernet Networks
- Core & Aggregation Switches
- Telecom Networks
- High-Speed Storage Networks
- Server Interconnects
OEM & ODM Service
Detwiler Tech provides professional OEM/ODM optical transceiver manufacturing services, including customized labels, EEPROM programming, compatibility coding (Cisco, Juniper, HPE, Arista, Huawei, NVIDIA, Dell, Brocade, Extreme, etc.), private packaging, and large-scale production for global distributors, system integrators, and data center solution providers.
See the Product from Every Critical Angle
Inspect the housing, contacts, termination interface and assembly details before sample approval.
Control the Critical Steps Before Production
A practical sourcing workflow for structured cabling products, from requirement review to repeat orders.
Sample Approval
Confirm the agreed construction, appearance and packing before volume production.
Process Visibility
Define inspection points and acceptance requirements for the ordered configuration.
OEM / ODM Coordination
Coordinate private labels, packaging, barcodes and approved product variants.
RFQ / SAMPLE REQUEST
Tell Us What the Application Requires
Share the target specification, quantity, cable construction and OEM/ODM requirements. Our team will review the critical interfaces before quotation.
- Product and cable compatibility review
- Sample, lead-time and packaging discussion
- Clear follow-up for export projects
CUSTOMER DISCUSSION
Product Questions & Customer Discussion
Read questions and experience from other customers, then add your own product or project feedback.
No published comments yet. Start the first useful discussion.
Sign in to comment
Registered customers use their account display name and can track moderation status from the account page.
Customer Login Create an Account