BOSA module with TEC integrate coaxial single fiber dual-wave laser

Abstract

A BOSA module with TEC integrate coaxial single-fiber double-wave laser is disclose, A TEC comprise a miniature semiconductor refrigerator, Thermistor RT, Laser, Backlight detector MPD, A downlink photodetector PD and a wavelength division multiplexer WDM, the TEC of the miniature semiconductor refrigerator is built in the BOSA and controlled by an external circuit to drive the TEC refrigerator inside the laser to act on the laser at a constant Laser working temperature without passing through any conductive medium in the middle, so that the temperature adjustment efficiency is very high; Because temperature dissipation is reduced, the power consumption is as low as (1 W; At the same time, the temperature of the laser is detected by the internal thermistor in real time and fed back to thecontrol circuit for adjusting the upper and lower temperature, so that the laser can work in a specific temperature environment for a long time without changing with the change of the temperature of the external environment, so as to achieve the purpose of constant output wavelength of the laser.

Description

technical field [0001] The invention belongs to the field of cable TV HFC two-way communication, and is especially suitable for an integrated coaxial single-fiber double-wave laser BOSA component on a two-way optical receiver based on RFoG+PON architecture, which can be used in an uplink transmission link to eliminate its optical beat interference. Background technique [0002] In the contemporary cable TV HFC (hybrid fiber-optic coaxial network) two-way communication network, because optical fiber has more advantages in price than coaxial cable, for operators, the use of optical fiber communication can reduce the project cost, so the new two-way network and the old network The transformation has basically adopted the fiber-to-the-home (FTTH) or fiber-to-the-building (FTTB) method based on the PON architecture, and is advancing to the "last mile" of the user terminal as a whole. The use of RFoG+PON network networking is the best solution based on the current DOCSIS communica...

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Problems solved by technology

But at the same time, there are still great defects. Due to the insufficient number of available wavelengths, the expansion of the network is not strong directly, and when used in different temperature environments at the same time, the wavelength due to the inherent error of the nominal wavelength and the influence of temperature offset, there may also be OBI

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