Alumina Ceramic Substrate For Crystal Oscillator

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Optoelectronic Transceiver Modules Alumina Ceramic Substrate

The aluminum oxide ceramic substrate for optoelectronic transceiver modules is a really important part. It plays a very important role in making modern optical-electrical communication systems work efficiently. It acts as a dependable base for putting together different optoelectronic components. This allows signals to be transmitted and received smoothly.

99.6% Alumina Ceramic Substrate For High-power Laser Diodes

1. Material Properties

(1) High - Purity Alumina Content

Typically, these substrates are composed of high - purity aluminum oxide (Al₂O₃), often with a purity level of 96% or higher. The high - purity alumina provides excellent electrical insulation properties. With a volume resistivity usually exceeding 10¹⁴ Ω·cm, it effectively prevents electrical leakage and crosstalk between different electrical paths on the substrate. This is of utmost importance in optoelectronic transceiver modules where multiple high - speed electrical signals are processed simultaneously.

(2) Thermal Conductivity

The aluminum oxide ceramic substrate has a decent thermal conductivity, generally in the range of 15 - 30 W/(m·K). In optoelectronic transceiver modules, heat is generated during the operation of components such as lasers and photodetectors. The substrate's ability to conduct heat away from these heat - generating elements helps in maintaining their optimal operating temperatures. By efficiently dissipating heat, it reduces the risk of thermal - related performance degradation or even component failure, ensuring the long - term stability and reliability of the module.

(3) Thermal Expansion Coefficient

It features a relatively low thermal expansion coefficient, usually around 6 - 8 × 10⁻⁶ /°C. This characteristic is beneficial because it ensures that the substrate's dimensions remain relatively stable over a wide range of temperatures. In optoelectronic applications, where temperature fluctuations can occur due to changes in the operating environment or the heat generated by the components themselves, a stable substrate dimension is essential for maintaining the precise alignment of optical and electrical components. Any significant expansion or contraction of the substrate could lead to misalignment of optical fibers, lenses, or electrical connectors, resulting in signal loss or degradation.

(4) Mechanical Strength and Hardness

The substrate exhibits good mechanical strength and hardness. It has a flexural strength that can range from 200 - 350 MPa, enabling it to withstand the mechanical stresses during the manufacturing process, such as cutting, grinding, and polishing, as well as the physical stresses that may occur during the transportation and installation of the transceiver module. The hardness of the substrate, with a Mohs hardness of around 9, provides resistance against scratches and abrasions. This ensures that the surface of the substrate remains smooth and free from damage, which is crucial for the accurate deposition and connection of optoelectronic components.

2. Surface Characteristics

(1) Smooth Surface Finish

The surface of the aluminum oxide ceramic substrate is carefully polished to achieve a smooth finish. The surface roughness is typically less than 0.5 μm. This smooth surface provides an ideal platform for the precise placement and bonding of optoelectronic components such as semiconductor lasers, photodiodes, and integrated optical circuits. It allows for better adhesion of the components and minimizes the scattering of light signals, thereby enhancing the optical coupling efficiency between different optical components.

(2) Metallization Compatibility

The substrate is highly compatible with metallization processes. Metallic layers such as gold (Au), silver (Ag), or copper (Cu) can be easily deposited onto the surface through techniques like sputtering or electroplating. These metallized layers serve as electrical contacts and interconnects for the optoelectronic components. The good adhesion between the metal and the ceramic substrate ensures reliable electrical connections, which are essential for the transmission of high - speed electrical signals in and out of the transceiver module.

High-power Electronic Modules Ceramic Substrate

3. Application in Optoelectronic Transceiver Modules

(1) Component Mounting and Interconnection

The aluminum oxide ceramic substrate provides a stable and reliable platform for mounting a variety of optoelectronic components. Lasers, which emit optical signals, and photodetectors, which receive and convert optical signals back into electrical signals, can be precisely placed and interconnected on the substrate. The electrical connections between these components and other associated circuitry, such as driver chips and amplifier circuits, are made through the metallized patterns on the substrate. This enables the efficient conversion and transmission of optical - electrical signals within the transceiver module.

(2) Signal Integrity and High - Speed Transmission

In optoelectronic transceiver modules, high - speed data transmission is a critical requirement. The aluminum oxide ceramic substrate's excellent electrical properties, including its high - purity insulation and low - loss electrical paths, contribute to the maintenance of signal integrity. It helps in reducing signal attenuation, crosstalk, and electromagnetic interference, ensuring that the optical - electrical signals are accurately transmitted and received at high speeds. This is particularly important in applications such as fiber - optic communication systems, where data rates can reach several gigabits per second or even higher.

(3) Optical Alignment and Coupling

The stable physical and surface characteristics of the substrate play a crucial role in optical alignment and coupling. The precise positioning of optical components on the smooth surface of the substrate, along with its dimensional stability, allows for accurate alignment of optical fibers and other optical elements. This maximizes the optical coupling efficiency, minimizing the loss of optical power during the transmission and reception of signals. As a result, the overall performance of the optoelectronic transceiver module in terms of optical signal transmission and reception is significantly enhanced.

We offer a variety of advanced ceramics, including alumina ceramics, aluminum nitride ceramics, silicon carbide ceramics, silicon nitride ceramics, and ceramic metallization materials, to improve and expand the performance of your products, processes, or systems. Whether you need high temperature stability, high hardness and wear-resistant surface, increased stiffness to resist weight radiation, anti-corrosion barrier or low thermal expansion rate, we can provide them. We can provide significant performance and cost advantages to meet your needs.

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