Photonetics 3646HE1540

Description

Operating Wavelength: 1540 nm

Center Wavelength: 1540 nm ± 20 nm

Wavelength Range: 1520 nm – 1560 nm

Insertion Loss: ≤ 0.5 dB (typical)

Isolation: ≥ 36 dB (minimum)

Return Loss: ≥ 55 dB

Polarization Dependent Loss (PDL): ≤ 0.1 dB

Maximum Input Power: +20 dBm (100 mW)

Operating Temperature Range: -40°C to +85°C

Storage Temperature Range: -40°C to +85°C

Fiber Type: Single-Mode Fiber (SMF-28e compatible)

Fiber Core/Clad Diameter: 9/125 µm

Connector Type: FC/APC

Connector Polish: Angled Physical Contact (APC)

Connector Key Orientation: Standard FC/APC key aligned

Optical Structure:
The device employs a Faraday rotator combined with input and output polarizers arranged in a non-reciprocal configuration. Forward-propagating light passes through the first polarizer, is rotated 45° by the Faraday rotator, and exits through the second polarizer aligned at 45°. Back-reflected light undergoes an additional 45° rotation (totaling 90° relative to the input polarizer axis) and is blocked, achieving high isolation.

Key Features:

• Polarization-Independent Operation: Maintains consistent performance regardless of input polarization state.
• High Isolation (≥ 36 dB): Effectively suppresses back-reflections from connectors, splices, and other network components.
• Low Insertion Loss (≤ 0.5 dB): Minimizes signal attenuation in the forward path.
• Wide Operating Temperature (-40°C to +85°C): Suitable for outdoor and industrial deployment.
• FC/APC Connectors: Ensures low back-reflection at connection points.
• Hermetic Sealing: Provides long-term reliability in harsh environments.

Advantages:

• Protects Laser Sources: Prevents feedback-induced instability and damage to transmitter lasers.
• Improves System OSNR: Reduces coherent backscatter noise in analog and digital fiber links.
• Compliant with ITU-T G.694.1: Compatible with DWDM grid spacing requirements.
• Compact Form Factor: Standard 3.6 mm diameter housing, compatible with Photonetics 3646 series packaging.

Applicable Industries:

• Telecommunications: Long-haul and metro DWDM networks
• CATV (Cable Television): Fiber-optic CATV headend and trunk distribution
• FTTH (Fiber-to-the-Home): Passive Optical Network (PON) systems, specifically GPON / XGS-PON at 1550 nm downstream
• Fiber Sensors: Interferometric sensing systems requiring back-reflection suppression
• Test & Measurement: Optical time-domain reflectometry (OTDR) and spectrum analysis setups

Model Series:
The 3646HE1540 belongs to the Photonetics 3646 Series of polarization-independent fiber optic isolators. Other variants in this series include:

• 3646HE1310 (1310 nm variant)
• 3646HE1490 (1490 nm variant)
• 3646HE1550 (1550 nm variant)

All share the same mechanical package, connector type, and performance class.

Installation Requirements:

• Install in a clean, dry environment free from dust and moisture.
• Ensure FC/APC connector mating with mating adapters of the same polish type (APC to APC).
• Do not exceed maximum input power of +20 dBm (100 mW).
• Maintain minimum bend radius of 30 mm for attached fiber pigtails.
• Secure using standard fiber management hardware (trays, racks, splice enclosures).

Usage Precautions:

• Never connect APC to UPC connectors — this will cause high insertion loss and potential fiber end-face damage.
• Do not expose to direct sunlight or high-intensity laser radiation beyond rated input power.
• Avoid mechanical shock or vibration beyond specified shock and vibration tolerances (typically 15g, 10–2000 Hz).
• Clean connector end-faces with approved fiber cleaning tools before every mating cycle.
• Store in original packaging with dust caps in place when not in use.

Package Dimensions (Typical):

• Housing Diameter: 3.6 mm
• Housing Length: ~40 mm (without connectors)
• Total Length with Connectors: ~60 mm

Housing Material: Stainless Steel (hermetically sealed)

Weight: ~10 grams (typical)