Apparatus and method for controlling gain of optical receiver in optical communication system
A technology of an optical receiver and an optical communication system, which is applied in the field of output gain devices and can solve problems such as complex circuits
Inactive Publication Date: 2006-06-21
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology
However, in this case, since the circuit becomes complicated and higher precision is required, it is difficult to additionally configure a circuit for generating a control signal proportional to the number of steps by which gain control is performed
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[0021] Embodiments according to the present invention will be described with reference to the drawings. For the purpose of clarity and simplicity, a detailed description of known functions and constructions incorporated herein will be omitted since it may obscure the subject matter of the present invention.
[0022] figure 2 It is a block diagram showing the composition of an Ethernet passive optical network applying the device and method of the present invention.
[0023] As shown, the Ethernet passive optical network includes an optical line terminal (OLT) 220, an optical splitter 230, and a plurality of optical network terminals (ONT) 240 (240 1 to 240 n ). The optical line terminal 220 provides a triple-play service that can provide not only bi-directional digital data services but also analog video services in EPON. The optical splitter 230 receives digital / analog data transmitted downward from the optical line terminal 220 and splits the received data into a plurali...
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The present invention discloses a device and method for linearly controlling the output gain of an optical receiver in an optical communication system. The gain control device includes: a light receiving device for converting an input optical signal into a current signal and outputting the current signal; a signal detection device for outputting a voltage signal corresponding to an intensity change in the current signal; attenuation degree determining means for determining the attenuation degree of the RF signal recovered from the current signal based on the voltage signal; and an amplifying unit for amplifying and outputting the recovered RF signal. Therefore, a broadcast signal can be stably provided because the gain of the optical receiver is linearly controlled, and the circuit structure of the optical receiver can be simplified because the gain of the optical receiver is controlled by a circuit having a relatively simple structure.
Description
technical field [0001] The present invention relates to an optical receiver used in an optical communication system, and more particularly to an apparatus and method for linearly controlling the output gain of an optical receiver. Background technique [0002] In general, optical communication systems are suitable for transmitting large amounts of data, such as broadcast signals. A representative optical communication system is a passive optical network (PON). The passive optical network includes an optical line terminal (OLT), multiple optical network terminals (ONTs) and an optical splitter between the optical line terminal and the optical network terminal, thereby forming a tree-shaped distribution layout. [0003] In the passive optical network, an optical line terminal (OLT) converts, for example, an analog and / or digital broadcast signal into an optical signal of a predetermined wavelength, multiplexes the optical signal and transmits it to an optical splitter. An op...
Claims
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IPC IPC(8): H04B10/27H03F3/08H03G3/20H03G3/30H04B10/272H04B10/40H04B10/50H04B10/524H04B10/564H04B10/60H04B10/69
CPCH04B10/66H04B10/2589H04J14/02216H04L12/28H04B10/60
Inventor 徐子源赵周哲李重熙
Owner SAMSUNG ELECTRONICS CO LTD