Transmission method, transmitter-receiver, and transmitting-receiving system

Abstract

A transmitter-receiver having a means for automatically determining the status of transmission medium such as optical fiber, and a means for automatically setting and resetting the transmission rate and/or output power according to the status of the transmission medium, a transmission loss and gain measurement method, and a transmitting-receiving system. A transmitter-receiver comprises at least: an output power controller for controlling the output power of a transmitter; an input power measuring section for measuring the strength of input signals; and an information processor for deriving the loss or gain of a path to change the output power of the transmitter and/or the rate of data transmission according to the derived loss or gain of the path. A transmission loss and gain measurement method applied to a system comprising transmission media and a plurality of the transmitter-receivers connected via the transmission media, comprises the steps of: transmitting information on the output power of a first transmitter-receiver from the first transmitter-receiver to a second transmitter-receiver; measuring reception strength by the second transmitter-receiver when the second transmitter-receiver receives the output power information; reading the output power information by the second transmitter-receiver; and comparing the reception strength with the output power information to calculate a transmission loss or gain by the second transmitter-receiver.

1 . A transmitter-receiver, comprising:
 a transmitter for transmitting signals to a transmission medium;   an output power controller for controlling the output power of the transmitter;   a receiver for receiving signals via a transmission medium;   an input power measuring section for measuring the strength of input signals;   a communication data processor for changing the rate of data transmission; and   an information processor for deriving the loss or gain of a path, and outputting a signal to change the output power of the transmitter and/or the rate of data transmission according to the derived loss or gain of the path.   
   
   
       2 . The transmitter-receiver claimed in  claim 1 , wherein the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator. 
   
   
       3 . The transmitter-receiver claimed in  claim 1 , wherein the output power controller includes a direct current generator for controlling the value of electric current. 
   
   
       4 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator; and   the output power controller includes a direct current generator for controlling the value of electric current.   
   
   
       5 . The transmitter-receiver claimed in  claim 1 , wherein the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver. 
   
   
       6 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the receiver includes a light receiving element; and   the input power measuring section includes a direct current meter for measuring the average photocurrent that flows through the light receiving element.   
   
   
       7 . The transmitter-receiver claimed in  claim 1 , wherein:
 the communication data processor includes a unit for detecting the code error of communicated frame data; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       8 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator;   the communication data processor includes a unit for detecting the code error of communicated frame data; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       9 . The transmitter-receiver claimed in  claim 1 , wherein:
 the output power controller includes a direct current generator for controlling the value of electric current;   the communication data processor includes a unit for detecting the code error of communicated frame data; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       10 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator;   the output power controller includes a direct current generator for controlling the value of electric current;   the communication data processor includes a unit for detecting the code error of communicated frame data; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       11 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the communication data processor includes a unit for detecting the code error of communicated frame data; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       12 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the receiver includes a light receiving element;   the input power measuring section includes a direct current meter for measuring the average photocurrent that flows through the light receiving element;   the communication data processor includes a unit for detecting the code error of communicated frame data; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       13 . The transmitter-receiver claimed in  claim 1 , wherein the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data. 
   
   
       14 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator; and   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data.   
   
   
       15 . The transmitter-receiver claimed in  claim 1 , wherein:
 the output power controller includes a direct current generator for controlling the value of electric current; and   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data.   
   
   
       16 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator;   the output power controller includes a direct current generator for controlling the value of electric current; and   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data.   
   
   
       17 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver; and   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data.   
   
   
       18 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the receiver includes a light receiving element;   the input power measuring section includes a direct current meter for measuring the average photocurrent that flows through the light receiving element; and   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data.   
   
   
       19 . The transmitter-receiver claimed in  claim 1 , wherein:
 the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data; and   the dividing rate is changed according to the presence or absence of the code error of the frame data and the size of the code error detected by the frame processor.   
   
   
       20 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator;   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data; and   the dividing rate is changed according to the presence or absence of the code error of the frame data and the size of the code error detected by the frame processor.   
   
   
       21 . The transmitter-receiver claimed in  claim 1 , wherein:
 the output power controller includes a direct current generator for controlling the value of electric current;   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data; and   the dividing rate is changed according to the presence or absence of the code error of the frame data and the size of the code error detected by the frame processor.   
   
   
       22 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator;   the output power controller includes a direct current generator for controlling the value of electric current;   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data; and   the dividing rate is changed according to the presence or absence of the code error of the frame data and the size of the code error detected by the frame processor.   
   
   
       23 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data; and   the dividing rate is changed according to the presence or absence of the code error of the frame data and the size of the code error detected by the frame processor.   
   
   
       24 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the receiver includes a light receiving element;   the input power measuring section includes a direct current meter for measuring the average photocurrent that flows through the light receiving element;   the communication data processor includes: a clock generator for generating a clock signal to be a reference for the rate of signal processing; a divider for dividing the clock signal from the clock generator at a designated dividing rate; and a frame processor for detecting the code error of input frame data; and   the dividing rate is changed according to the presence or absence of the code error of the frame data and the size of the code error detected by the frame processor.   
   
   
       25 . The transmitter-receiver claimed in  claim 1 , wherein the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed. 
   
   
       26 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed.   
   
   
       27 . The transmitter-receiver claimed in  claim 1 , wherein:
 the output power controller includes a direct current generator for controlling the value of electric current; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed.   
   
   
       28 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed.   
   
   
       29 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the receiver includes a light receiving element;   the input power measuring section includes a direct current meter for measuring the average photocurrent that flows through the light receiving element; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed.   
   
   
       30 . The transmitter-receiver claimed in  claim 1 , wherein:
 the communication data processor includes a unit for detecting the code error of communicated frame data, a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       31 . The transmitter-receiver claimed in  claim 1 , wherein the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed according to the presence or absence of the code error of the frame data and the size of the code error. 
   
   
       32 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter includes: a laser diode for radiating laser beams; an optical modulator for modulating the laser beams; and an optical modulator driver for driving the optical modulator; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       33 . The transmitter-receiver claimed in  claim 1 , wherein:
 the output power controller includes a direct current generator for controlling the value of electric current; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       34 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       35 . The transmitter-receiver claimed in  claim 1 , wherein:
 the transmitter and the output power controller include: a direct modulation laser diode for outputting direct optical signals; a laser diode driver for driving the direct modulation laser diode; a bias point controller for controlling the bias point of the laser diode driver; and an amplitude modulation controller for controlling the amplitude modulation of the laser diode driver;   the receiver includes a light receiving element;   the input power measuring section includes a direct current meter for measuring the average photocurrent that flows through the light receiving element; and   the communication data processor includes: a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed according to the presence or absence of the code error of the frame data and the size of the code error.   
   
   
       36 . The transmitter-receiver claimed in  claim 1 , wherein:
 the communication data processor includes a unit for detecting the code error of communicated frame data, a plurality of data input-output ports; a unit for multiplexing data in the data input-output ports to transmit the data; a unit for demultiplexing input data to output the data to the input-output ports; a unit for increasing or decreasing the number of multiplexing when data in the data input-output ports are multiplexed according to the presence or absence of the code error of the frame data and the size of the code error; and   the data transmission rate is changed according to the presence or absence of the code error of the frame data and the size of the code error.