Přehled produktů
TFLN (Thin-Film Lithium Niobate) and TFLT (Thin-Film Lithium Tantalate) on Silicon Photonics (SiPh) represent an advanced heterogeneous integration platform developed to overcome the intrinsic physical limitations of silicon in photonic systems.
Silicon photonics offers excelle
nt scalability and CMOS compatibility, but it lacks a strong linear electro-optic (Pockels) effect and suffers from relatively high loss and limited modulation linearity. To address these constraints, thin-film LiNbO₃ and LiTaO₃ are introduced onto SiPh platforms through wafer bonding or hybrid integration techniques.
This solution enables the combination of:
- High-speed electro-optic performance from TFLN/TFLT
- Large-scale integration capability from silicon photonics
It is widely used in next-generation optical interconnects, coherent communication systems, and microwave photonics.
Core Material Definition
TFLN (Thin-Film Lithium Niobate)
Thin-film lithium niobate provides a strong Pockels effect, enabling ultra-fast optical modulation with low insertion loss. It is currently the industry standard for high-speed optical modulators.
TFLT (Thin-Film Lithium Tantalate)
Thin-film lithium tantalate exhibits similar electro-optic behavior but offers improved thermal stability, higher optical damage threshold, and better wafer-level uniformity. It is considered a promising alternative for high-power and large-scale applications.
Why Integrate TFLN / TFLT with Silicon Photonics
Silicon alone cannot efficiently support high-performance modulation due to:
- Absence of intrinsic electro-optic effect
- Dependence on plasma dispersion effect, leading to higher optical loss
- Limited linearity for advanced modulation formats
By integrating TFLN/TFLT onto SiPh, the platform achieves:
- Modulation bandwidth exceeding 100 GHz, supporting 800G and 1.6T systems
- Lower half-wave voltage (Vπ), reducing power consumption
- Ultra-low optical propagation loss
- Wide transparency window from visible to mid-infrared
Integration Approaches
1. Heterogeneous Integration (Bonding Method)
Thin-film LN or LT is bonded onto pre-fabricated silicon or silicon nitride (Si/SiN) waveguides.
- Optical coupling via evanescent field
- Maintains full compatibility with silicon photonics fabrication
- Suitable for large-scale manufacturing
2. LNOI / LTOI Waveguide Approach
Waveguides are directly etched into the thin-film LN or LT layer.
- Strong optical confinement in single-crystal material
- Highest modulation efficiency
- More complex fabrication and lower compatibility with standard SiPh processes
Typical Structure (Image Placement Recommended)
Structure 1: Hybrid Waveguide (SiPh + TFLN/TFLT)
- Si or SiN waveguide (bottom layer)
- SiO₂ bonding layer
- Thin-film LN/LT layer (~300–600 nm)
- RF electrodes on top
Structure 2: Ridge Waveguide (LNOI/LTOI)
- LN/LT thin film
- Buried oxide (BOX)
- Silicon substrate
Performance Parameters
| Parametr | TFLN | TFLT | Notes |
|---|---|---|---|
| Electro-optic coefficient (r33) | ~31 pm/V | ~30 pm/V | Similar modulation efficiency |
| 3-dB Bandwidth | 100–400 GHz+ | 70–100 GHz+ | Much higher than Si modulators (~40 GHz) |
| Vπ·L | 1.8–2.5 V·cm | 2.0–3.5 V·cm | Lower means lower drive voltage |
| Optical loss | <0.1 dB/cm | <0.1 dB/cm | Extrémně nízká |
| Refractive index | ~2.1–2.2 | ~2.1 | High confinement capability |
| Curie temperature | ~1140°C | ~600°C | Material property reference |
| Optical damage threshold | Mírná | Velmi vysoká | TFLT better for high power |
| DC drift | Noticeable | Very low | TFLT has superior stability |
Hlavní výhody
High-Speed Modulation Capability
Supports ultra-high bandwidth optical modulation beyond 100 GHz, enabling next-generation data transmission rates.
Low Power Consumption
Reduced half-wave voltage allows lower driving power compared with silicon-based modulators.
Superior Optical Performance
Low propagation loss and high refractive index enable compact and efficient photonic integration.
Thermal and Bias Stability (TFLT Advantage)
TFLT provides improved resistance to thermal variation and minimal DC drift, critical for long-term system stability.
Scalable Manufacturing
Bonding-based integration preserves silicon photonics process compatibility, supporting wafer-scale production.
Scénáře použití
- Data center optical interconnect (400G / 800G / 1.6T)
- Coherent optical communication systems
- Microwave photonics and RF-over-fiber
- Integrated photonic circuits (PICs)
- High-power laser modulation systems
- LiDAR and sensing platforms
Selection Guidance
Choose TFLN when:
- Maximum modulation bandwidth is required
- Mature ecosystem and supply chain are preferred
- Target applications include coherent optics and ultra-high-speed transmission
Choose TFLT when:
- Bias stability and low DC drift are critical
- High optical power handling is required
- Long-term reliability and thermal robustness are priorities
ČASTO KLADENÉ DOTAZY
1. What is the main benefit of TFLN/TFLT on SiPh compared to silicon modulators?
The key advantage is the presence of a strong electro-optic effect, enabling higher bandwidth, lower loss, and lower power consumption than silicon-only modulators.
2. How does evanescent coupling work in hybrid integration?
Light propagates in the silicon waveguide and partially extends into the thin-film LN or LT layer. This overlapping optical field allows efficient modulation without fully transferring the optical mode.
3. Is this platform suitable for large-scale manufacturing?
Yes. Bonding-based heterogeneous integration allows compatibility with standard silicon photonics fabrication processes, enabling high-volume and cost-effective production.
Recenze
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