The Difference Between BOSA and Optical Transceiver Modules

The optical device BOSA is a part of the optical transceiver module, which consists of transmitting and receiving devices. The light emitting part is called TOSA, the light receiving part is called ROSA, and the two together are called BOSA.

Its working principle: a conversion device that converts optical signals (electrical signals) carrying information into electrical signals (optical signals).

TOSA

TOSA is the English abbreviation of Transmitter Optical Subassembly. Its main function is to convert electrical signals into optical signals. It consists of a laser, an adapter and a die sleeve. An isolator and an adjustment ring are also added to the long-distance optical module. The isolator plays the role of anti-reflection, and the adjustment ring plays the role of adjusting the focal length. The types of lasers include VCSEL, FP, DFB, EML, etc. The type of laser can determine the intensity of light emission;

ROSA

ROSA is the English abbreviation of Receiver Optical Subassembly. Its main function is to convert optical signals into electrical signals. ROSA consists of a detector and an adapter. The detector types can be divided into PIN and APD. The adapters are made of metal and plastic PE. The type of adapter determines the sensitivity of receiving light;

BOSA

BOSA is the English abbreviation of Bi-Directional Optical Sub-Assembly. Its main function is to convert optical signals and electrical signals into each other. BOSA is one of the important components of single-fiber optical modules. It consists of a transmitting laser, a receiving detector, an adapter, a filter, a base, an isolator and a die sleeve.

Optical transceiver modules are divided into single-fiber and dual-fiber. Single-fiber optical modules have only one interface, and the core component is BOSA. The cost of BOSA is higher than that of TOSA and ROSA, so the price of single-fiber optical modules is relatively high. The core components of the dual-fiber optical module are TOSA and ROSA. The receiving end uses ROSA to convert optical signals into electrical signals, and the transmitting end uses TOSA to convert electrical signals into optical signals. The cost of TOSA and ROSA is lower than that of BOSA, so the price of dual-fiber optical modules is lower than that of single-fiber optical modules.