Optical user business interface unit

The invention discloses an optical user business interface unit which comprises an optical module in the down direction, a down bandpass filter, a down power amplifier, a duplexer, an up low noise amplifier, an up bandpass filter and another module. The optical module in the down direction converts light signals into electrical signals; the down bandpass filter separates down radio frequency signals of a specific business from mixed business signals; the down power amplifier amplifies down radio frequency signals of the specific business and provides appropriate grain; the duplexer provides a frequency channel for the down signals to an output port and suppresses the noise; the duplexer provides the frequency channel for up input signals and restrains space signals of the non-business received by an antenna in the up direction; the up low noise amplifier amplifies the received up signals; the up bandpass filter separates the up carrier frequency signals of the certain specific business from broadband signals