The role ofoptical modulesin optical communication networks is photoelectric conversion, so what optical devices are mainly composed of optical modules? Walsun will reveal the answer for everyone.
First of all, the two most important parts of theoptical transceiverare the optical transmitting assembly (TOSA) and the optical receiving assembly (ROSA). Among them, the optical transmitting assembly (TOSA) mainly plays the role of converting electrical signals into optical signals (E/O ), judging its performance indicators mainly include optical power and threshold.
TOSA is mainly composed of a laser (TO-CAN), an adapter, and a die sleeve. In the long-distance optical module, an isolator and an adjustment ring are also added. The isolator plays the role of anti-reflection, and the adjustment ring is used to adjust the focal length. effect.
The function of the optical receiving component (ROSA) is to convert the optical signal into an electrical signal (O/E), and its performance indicators are mainly sensitivity (SEN), and the ROSA is composed of a detector and an adapter. TIA, APD-TIA, the adapter has two kinds of metal and plastic PE parts.
The light emitting device includes FP, DFB, VCSEL, EML, etc. The light emitting device generally integrates a laser diode (LD Chip), a backlight detection tube (PIN Chip), a thermistor, a TEC cooler and an optical Alignment mechanism and other components.
Bi-Directional Optical Sub Assembly (BOSA)
TOSA and ROSA are essential components in the uni-directional transceivers which transmit on one fiber optic strand and receive on the other fiber optic strand. In case of bi-directional transceivers, BOSA is used which is a combination of a TOSA, a ROSA and additionally a WDM filter. The WDM filter enables the bi-directional transceiver to split the wavelengths into two separate wavelengths. After the wavelengths are split, transmit and receive functions can work on a single strand of fiber.
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