1650nm Dual Stage 3 Port Optical Circulator P Grade SMF 28e Low Loss High Isolation FC APC Steel Tube
1650±5nm Two-Stage Three-Port Optical Circulator
1. Product Introduction
The 1650±5nm two-stage three-port optical circulator is a high-performance passive optical device designed for fiber optic line monitoring, OTDR testing, PON network maintenance, and optical measurement systems. The product employs a two-stage optical structure, enabling directional transmission of optical signals between different ports while effectively suppressing backlight, port crosstalk, and signals from non-target directions.
2. Key Features
| Parameter |
Unit |
Specification |
Test Data |
| Operating Wavelength |
nm |
1650±5 |
1650±5 |
| Insertion Loss(Port1-Port2) @1650nm,23°C |
dB |
≤1.0 |
0.99 |
| Insertion Loss(Port2-Port3) @1650nm,23°C |
dB |
≤1.0 |
0.71 |
| Isolation (Port2-Port1) @λop,25±5°C |
dB |
≥45 |
57 |
| Isolation(Port3-Port2) @λop,25±5°C |
dB |
≥45 |
47 |
| Return Loss (All Ports) @23°C |
dB |
≥45 |
54 |
| Directivity(Port1-Port3) @23°C |
dB |
≥60 |
64 |
| Power Handling |
mW |
500 |
| Operating Temperature |
°C |
0 ~ +70 |
| Storage Temperature |
°C |
-40 ~ +85 |
| Package Dimension |
mm |
(∅)5.5±0.1 x (L)50±1 |
| Fiber Color |
- |
Port1:Red,Port2:Blue,Port3:White |
| Fiber Type |
- |
SMF-28e |
| Fiber Jacket |
- |
900um loose tube |
| Fiber Length |
m |
Port1&Port3:≥0.5；Port2:≥0.25 |
| Connectors |
- |
Port1&Port3:FC/APC；Port2:FC/PC |
- 1650±5nm Operating Wavelength
Designed for the 1650nm fiber optic monitoring and testing band, suitable for online line diagnostics and dedicated optical measurement systems.
- Two-Stage Optical Structure
Compared to conventional single-stage structures, the two-stage design provides more stable isolation performance and stronger crosstalk suppression capabilities.
- Low Insertion Loss
Insertion loss IL≤1.5dB helps reduce the device's impact on the system's optical power budget.
- High Return Loss
Return loss RL ≥ 50dB reduces the impact of end-face reflections on the stability of lasers, detectors, and test systems.
- Stable Isolation Performance
Isolation ISO ≥ 33dB effectively suppresses back-transmitted optical signals.
- High Crosstalk Suppression
Crosstalk ≥ 50dB reduces interference from non-target signals between different ports.
- SMF-28e Single-Mode Fiber
Utilizes industry-standard single-mode fiber for easy integration with existing optical communication and test systems.
- Full FC/APC Connector Configuration
All three ports use FC/APC connectors, suitable for optical systems with high reflection performance requirements.
- Color-coded Port Identification
P1 red, P2 blue, P3 white for easy production assembly, testing, and field maintenance.
- Reliable Steel Tube Encapsulation
Compact φ5.5*50mm steel tube encapsulation provides stable mechanical protection for the internal optical structure.
- Includes PMD Testing
Neutral English test reports may include PMD and key optical performance test data, facilitating customer quality verification and project archiving.
3. Main Applications
- 1650nm OTDR Fiber Optic Test System
- FTTH and PON Online Monitoring System
- Fiber Optic Line Fault Detection
- Fiber Optic Network Maintenance Equipment
- Optical Test and Measurement Instruments
- Bidirectional Fiber Optic Communication System
- Fiber Optic Sensing System
- Laser and Optical Amplifier Protection
- Customized Passive Optical Modules
- Laboratory Optical Path and R&D Test Platform
4. FAQ
Q1: What is a two-stage optical circulator?
A two-stage optical circulator employs a two-stage optical isolation or ring structure to enhance the suppression of signals from non-target directions. It is suitable for optical communication and test systems with high requirements for isolation, crosstalk, and system stability.
Q2: What is the operating wavelength of this circulator?
The product's nominal operating wavelength is 1650±5nm, primarily targeting 1650nm fiber optic monitoring and testing applications.
Q3: What type of fiber does the product use?
The product uses SMF-28e single-mode fiber, compatible with common single-mode fiber optic communication and testing systems.
Q4: What are the main optical performance parameters?
Standard specifications include:
- Insertion loss IL≤1.5dB
- Return loss RL≥50dB
- Isolation ISO≥33dB
- Crosstalk≥50dB
Actual test results are subject to the accompanying English test report.
Q5: How are the three ports distinguished?
The product uses different colored 900μm loose tubes to distinguish the ports:
- P1: Red
- P2: Blue
- P3: White
This design reduces port connection errors during installation and testing.
Q6: What is the pigtail length?
The total length of each port, including the connector, is 100±5cm. Other pigtail lengths can be customized according to the customer's equipment structure and installation requirements.
Q7: What type of connector is used?
All three ports are equipped with FC/APC connectors. FC/APC connectors have low end-face reflection, making them suitable for test and monitoring systems with high return loss requirements.
Q8: What is PMD testing?
PMD stands for Polarization Mode Dispersion, used to evaluate the transmission delay difference between different polarization modes. This test is crucial for performance evaluation in high-speed communication, precision measurement, and long-distance fiber optic systems.
Q9: Is an English test report provided?
Yes. A neutral English test report is provided with the product, including agreed-upon test items such as insertion loss, return loss, isolation, crosstalk, and PMD.
Q10: What is the packaging method?
The product is packaged in a blister pack to reduce the risk of mechanical damage to the connectors, pigtails, and steel tubing during transportation and storage.
Q11: Is customization supported?
Supported. Customization of operating wavelength, fiber type, connectors, pigtail length, loose tube color, package size, port configuration, and test report content is available to meet project requirements.
