Photonetics 3646HE1540

Product Brief Introduction

• This product is a rack-mount pluggable tunable laser source independently developed by Photonetics (sub-brand of GN Nettest/EXFO), belonging to classic Tunics-OM modular optical test instrument product line.
• It is engineered to output stabilized single-mode laser centered at 1540nm within C-band optical communication spectrum, dedicated for optical component calibration, DWDM system testing, fiber optic characterization and laboratory spectral analysis.
• All finished units complete strict factory aging test and optical performance calibration complying with international telecommunication industry standards, supporting long-duration uninterrupted continuous operation under standard industrial ambient environment.

3. Technical Specifications (Core Data Bold Marked)

Optical Specifications

1. Central Nominal Output Wavelength: 1540 nm; Full Tunable Wavelength Range: 1520 nm ~ 1570 nm (C-Band Standard Telecom Band)
2. Optical Spectral Linewidth: ＜0.01 nm (narrow linewidth grade for high-coherence optical output)
3. Side Mode Suppression Ratio (SMSR): ≥60 dB (rated nominal); minimum guaranteed value ≥40 dB under full operating temperature range
4. Output Optical Mode: Strict Single-Mode Fiber Output (SMF, Corning SMF-28 compatible)
5. Rated Output Optical Power: Standard fixed grade centered at 1540nm with calibrated stable output power; peak instant output power reaches hundreds of milliwatts (unit exclusive of high-power customized variant)
6. Maximum Analog Modulation Frequency: Up to 300 MHz for external electrical modulation signal input
7. Beam Quality Factor: Near diffraction-limited beam output, fixed beam divergence matching single-mode fiber coupling requirement

Electrical & Environmental Specifications

1. Standard Operating Ambient Temperature: 0℃ ~ +40℃ (calibration specified operating range); allowable extreme storage temperature: -20℃ ~ +60℃
2. Enclosure Ingress Protection Grade: IP65 for module outer metal housing
3. Rated DC Input Working Voltage: +12V industrial standard regulated power supply, built-in overvoltage, overcurrent reverse connection protection circuit
4. Net Weight of Single Module Unit: 1.0 kg; gross shipping packaging weight: 3.0 kg including original anti-shock carton and accessory set
5. Physical Outer Dimension: Standard 19-inch rack plug-in modular size, compact fixed outline for seamless integration into multi-channel optical test chassis

4. Functional Features

1. Precise digital wavelength locking function: built-in automatic wavelength closed-loop locking circuit, real-time compensate wavelength drift induced by ambient temperature fluctuation and component aging
2. Automatic Power Control (APC) embedded circuit: continuously stabilize output optical power within fixed tolerance range, eliminate power fluctuation caused by drive current variation
3. Local panel human-computer interaction: equipped with digital LED parameter display screen, numeric keypad, fine-tuning rotary encoder for direct wavelength/power parameter setting on front panel without external controller
4. Built-in real-time self-diagnosis system: automatically detect internal drive circuit, laser chip temperature and optical output abnormal state, feed back fault code via front digital display for rapid maintenance positioning
5. External remote communication interface: support standard serial bus remote parameter configuration, compatible with upper computer automatic test system for batch automated optical testing
6. Functional expandability: reserved internal extension slot to install optional polarization maintaining fiber output module (Option P6 variant: 3646HE-P6) according to actual application requirement

5. Performance Parameters (Classified Index)

Optical Performance Index

• Wavelength Tuning Resolution: 0.01nm minimum incremental tuning step
• Output Power Stability: ≤±0.5% power fluctuation within continuous 24-hour fixed ambient operation
• Insertion Loss of Internal Optical Path: ≤0.8dB for built-in collimation and coupling optical assembly
• Polarization Dependent Loss (PDL): ≤0.1dB for standard single-mode output port

Reliability Performance Index

• Rated continuous working lifespan: minimum 80000 hours under specified standard operating environment
• Vibration resistance standard: comply with IEC60068 industrial vibration test specification for laboratory and factory production environment
• Calibration validity period: 12 months per original factory calibration certification standard

6. Material Composition

1. Outer Enclosure Shell: Whole-body cold-rolled aluminum alloy with anti-oxidation hard anodizing surface treatment, corrosion-resistant and high thermal conductivity for passive heat dissipation
2. Core Light Emitting Medium: InGaAsP compound semiconductor laser epitaxial wafer (indium gallium arsenide phosphide), the core gain medium determining 1540nm central emission wavelength
3. Internal Optical Components: Ultra-precision fused silica collimating lens, anti-reflection coated Fabry-Perot resonant cavity glass sheet, single-mode pigtailed fiber with ceramic ferrule end-face polishing
4. Electronic Circuit Baseboard: FR-4 high-temperature resistant glass fiber printed circuit board (PCB), military-grade surface mount semiconductor drive chip and precision fixed-resistance components
5. Thermal Dissipation Auxiliary Parts: Copper alloy heat sink and high thermal conductivity silicone thermal pad attached between laser chip and aluminum housing

7. Structural Characteristics

1. Overall split modular structure: divided into front panel operation module, intermediate electrical drive cavity and rear optical output cavity three independent sealed sub-assemblies, all separated by aluminum partition board to avoid optical path and circuit mutual interference
2. Front panel layout: upper area digital display window + warning safety laser radiation label, middle numeric input keypad, right side fine-adjustment rotary knob, bottom two optical fiber output interface sockets and power input terminal port
3. Internal resonant cavity structure: integrated micro-electro-mechanical (MEMS) tuning component inside laser resonant cavity to realize continuous C-band wavelength mechanical tuning
4. Rear chassis structure: standard 19-inch rack card edge connector for power supply and remote communication signal transmission, positioning bayonet lock fixed design for quick plug-in into standard optical test chassis

8. Working Principle

1. Electrical Pumping Excitation Stage: Stable regulated +12V DC power is input into internal laser drive circuit, after APC constant-current conversion, forward bias drive current is injected into InGaAsP semiconductor PN junction active layer; electrons and holes complete carrier recombination inside active gain medium to release photon energy via spontaneous emission effect.
2. Population Inversion Establishment: Continuous injection of drive current forms population inversion state inside semiconductor active layer, making excited-state carrier quantity exceed ground-state carrier quantity to satisfy laser oscillation precondition.
3. Resonant Cavity Optical Amplification: Cleaved crystal end-facets of laser chip plus external coated Fabry-Perot optical sheet compose closed optical resonant cavity; generated photons complete repeated round-trip reflection inside resonant cavity and obtain continuous stimulated emission amplification to form coherent narrow-linewidth laser beam.
4. Wavelength Tuning & Output Control: Built-in MEMS tuning element changes resonant cavity effective optical length under digital control signal to realize continuous wavelength shifting within 1520~1570nm range; collimating lens couples amplified laser into single-mode tail fiber for final external optical output, APC circuit real-time adjusts drive current to lock output optical power at preset fixed value.

9. Advantage Highlights

1. Ultra-narrow spectral linewidth characteristic effectively reduces optical phase noise, fully match high-speed DWDM coherent optical communication system testing requirement
2. Low thermal resistance integral packaging design realizes efficient passive heat dissipation, long-term running parameter drift far below industry common laser source average level
3. All core optical components complete NIST traceable factory calibration, measured data has international metrology certification validity for laboratory formal test report compilation
4. Compact pluggable modular design saves test equipment cabinet installation space, supports mixed insertion with other Tunics-OM series optical modules inside same chassis
5. Low energy consumption optimized circuit design reduces long-term operating power cost and auxiliary cooling equipment configuration requirement
6. Built-in comprehensive multi-layer protection mechanism effectively resist overcurrent, overvoltage, static electricity and ambient dust erosion to extend service cycle

10. Applicable Industries

1. Optical Communication Industry: DWDM component production testing, optical amplifier EDFA parameter calibration, optical transceiver module factory incoming inspection, fiber optic cable loss & dispersion characteristic measurement
2. Optoelectronic Laboratory & Scientific Research: Spectral analysis experiment, coherent laser interference research, new optical material photoelectric characteristic development test
3. Precision Optical Sensing Industry: Fiber Bragg Grating (FBG) sensor calibration, distributed optical fiber temperature/strain sensing system debugging
4. Medical Optoelectronics Industry: Near-infrared biological spectrum detection equipment calibration, minimally invasive laser medical auxiliary light source parameter verification
5. Industrial Precision Measurement Industry: Non-contact laser dimensional inspection equipment calibration, optical interferometer standard light source configuration

11. Model Series Classification

• Parent Product Line: Photonetics Tunics-OM Series Tunable Laser Source
• Same Series Core Model Branches:
  1. 3646RA00: Wide-range full C-band tunable basic version
  2. 3646HE Series: Fixed central wavelength customized sub-series (1530nm/1540nm/1550nm three fixed center wavelength subdivisions, target model 3646HE1540 = fixed 1540nm center wavelength specification)
  3. 3646HE-P6: Optional polarization-maintaining fiber output upgraded variant based on 3646HE base platform

12. Installation Requirements

1. Rack Installation Condition: Install into standard 19-inch industrial optical test chassis fixed slot, ensure chassis internal forced air cooling system normal startup to maintain cabinet internal temperature between 22℃~28℃ constant range
2. Power Supply Matching Requirement: Connect with certified industrial regulated +12V DC power adapter with ripple coefficient ≤1mV; strictly prohibit parallel connection with high-power inductive load power supply on same power loop
3. Optical Fiber Connection Specification: Use standard single-mode ceramic ferrule FC/APC connector fiber to link module output port, keep fiber bending radius larger than 30mm to avoid fiber macrobending loss causing power abnormal drop
4. Ambient Installation Environment: Install position avoids direct sunlight irradiation, corrosive gas accumulation and severe mechanical vibration source; relative ambient humidity fixed between 30%~70% non-condensation range
5. Grounding Standard: Complete equipment chassis reliable protective grounding via standard grounding terminal to eliminate static damage risk for internal precision semiconductor chip

13. Usage Precautions

1. Startup Operation: Complete 30 minutes preheating after power-on before formal optical parameter testing, wait internal temperature control system reach steady state to guarantee output wavelength and power meet calibrated nominal value
2. Optical Port Protection: Keep unused output optical port equipped with original dust protection cap at all times to prevent dust particle adhesion on end-face causing coupling loss increment
3. Prohibited Operation: Never disassemble module sealed aluminum housing without professional factory maintenance authorization; internal laser chip and optical components are sensitive to dust and mechanical impact
4. Storage Specification: When long-term idle storage, place unit inside original sealed moisture-proof carton under 10℃~30℃ dry ambient environment, avoid low-temperature freezing and high-humidity mildew
5. Safety Regulation: Front panel laser warning label area marks Class 3B laser radiation level; avoid naked eye direct observation of bare output laser spot to prevent irreversible retinal injury
6. Maintenance Cycle: Conduct full optical performance recalibration every 12 months per factory specification; all maintenance operations must adopt factory-matched original spare parts only