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Active Optical Connector, the BF4MC Series, Solves the Problems of Electrical Connection. High speed signal transmissions with no EMI noise. Optical transmissions achieved by simplified electrical connections

Do you feel the limitations of electrical connection?

Electrical connection is too hard...Thick Cable. Fixing Component Position. Faster Transmission. Noise Resistance. Board Space. Distance. Hard Cable. Circuit Space Expansion. Multiple Cables. Signal Attenuation. Non-bending Cable. Isolated Treatment. Complicated Circuit. Shielded Design. Maintenance Efficiency. More Components Required
Solve with the active optical connector, the BF4MC Series ! High Speed Isolated Transmission/ Space-saving. Noise Resistance/ Small Diameter/ Bending Durability
Series Page
Design Note

1. High Speed Isolation Transmission and Space-saving

Reduce the Number of Isolation Components and Circuit Size

Electrical Connection Challenges: - Securing Component Position - Number of Isolated Components Solve with BF4MC (Active Optical Connector): - Flexible Layout - Gbit Transmission with One Connector

High Speed Isolated Transmission

Photocouplers, isolators and pulse transformers are well known as electrical isolation components. However, one isolation component can only isolate a signal to a transmission speed of several hundred Mbps. On the other hand, the semi-conductor mounted in the BM4MC Series plug enables isolation with photoelectric conversion and high speed isolated transmission from 50Mbps to 6.25Gbps.

Circuit Size Reduction

A single BF4MC Series connector enables high speed isolated transmission at 6.25Gbps, reducing the number of isolation components and allowing for flexible board layout through use of a cable assembly rather than a electrical isolation component, which requires securing of the components across the isolation width.

2. Noise Resistance/ Small Diameter/Bending Resistance

No more shielded cables that are hard, wide, or difficult to bend.

Electrical Connection Challenges: - Bulky, Heavy, Difficult to Bend Cables - The Difficulty of Shield Treatment Solve with BF4MC (Active Optical Connector): - Optical Fiber for Noise Resistance - Bending Durable Fibers with Small Diameter

Noise Resistance

Shielding treatment is common for noise resistance however it takes a lot of effort to identify noise sources, frequency, etc. before shield treatment. Since the BF4MC Series uses optical transmission, it is not affected by noise, making EMI prevention easy.

Small Diameter/ Bending Resistance

Cables used in electrical wiring will have a greater diameter and require more shielding in accordance with the transmission conditions (speed, distance, loss, noise). This results in heavier, bulkier cables that are difficult to bend. In contrast, the optical fiber used in the BF4MC Series has much more efficient bending resistance than ordinary fibers. The BF4MC Series maintains a bending radius of R=2.0mm, and a loss of less than 1dB.
Additionally, the BF4MC Series fiber diameter is ø0.5mm regardless of the transmission conditions.

3. Long Distance and Low Attenuation

Low attenuation and accurate long distance
are the biggest advantages of optic communication.

Electrical Connection Challenges: - Electrical cables have more attenuation. - Long distances require in-line devices. Solve with BF4MC (Active Optical Connector): - Optical fiber has low attenuation. - Relay with an Optic Connector Cable

Long Distance and Low Attenuation

Electrical cable attenuation must be considered for long distance electrical transmission. Attenuation varies based on material, cable diameter, etc. When extending a long distance with electricity, a driver or equalize must be inserted in the input/output of in-line device or board’s cable in consideration of signal attenuation. In contrast, attenuation (propagation loss) of the optical fiber used in the BF4MC Series is 5.0dB/km Max. (Wavelength: 850nm)* The BF4MC Series has lower attenuation than electrical cables, enabling long distance transmission without in-line devices or drivers/equalizers.
However, since the optical fiber diameter of ø0.5mm used in BF4MC cannot realistically be routed to outside of devices, a BF4MC cable assembly with LC/SC on one end is available to relay optic fiber cables to the device interface. Please contact Hirose Electric for details on interface connections.
*When fiber length is 1km or longer

4. Low Power Consumption and Simplified Circuit

Low Power Consumption and Simplifed Design
by Reducing the Number of Electrical Components

Electrical Connection Challenges: - Increase in IC Components based on Transmission Conditions - Increasing IC Components Complicates the Circuit Solve with BF4MC (Active Optical Connector): - Transmission with a Single Connector - Simplification via Recommended Circuit

Low Power Consumption

If there are many transmission conditions, then IC components will need to be added to the electrical wiring depending on the application. The more transmission conditions there are, the number of IC components increases, leading to increased power consumption. The BF4MC Series does not require additional IC components as long as the transmission conditions match the BF4MC specifications, enabling low power consumption.
<BF4MC Power Consumption>
Single power source: 120 mW (Max.)
2 source power: 80 mW (Max.)

Circuit Simplification

A greater number of transmission conditions leads to the electrical wiring requiring additional IC components in accordance with the application. As the number of IC components increases, the circuit becomes more complicated.
If the transmission specifications of the BF4MC Series are met, no additional IC components are required. It works just by usage of the BF4MC recommended circuit and provides circuit simplification. Please refer to the design notes and evaluation boards provides as reference for the recommended circuit. Please contact Hirose Electric for details.

5. Design Support and Product Proposals

Hirose provides support and product proposals
from the early stage of product design.

If you contact us in the early stages of product design,
we will provide you with the most ideal product for the project and support.
Additionally, if you want to switch from an electrical connection to
an optical connection during the design process, please feel free to ask us.

Series Page
Design Note