JP2004048583A5

JP2004048583A5 -

Info

Publication number: JP2004048583A5
Application number: JP2002205842A
Authority: JP
Filing date: 2002-07-15
Publication date: 2005-10-27
Anticipated expiration: 2022-07-15

Claims

An optical multiplex transmission apparatus that transmits a digital data signal to a selected transmission destination and transmits a carrier wave modulation signal to all transmission destinations,
Data light that selects a wavelength corresponding to each transmission destination from a predetermined first wavelength band, modulates light having the selected wavelength based on a digital data signal to be transmitted to the transmission destination, and outputs the modulated data light signal A transmission unit;
An RF optical transmitter that modulates light occupying a predetermined second wavelength band that does not overlap the first wavelength band based on the carrier wave modulation signal, and outputs the modulated optical signal as an RF optical signal;
A multiplexing unit that synthesizes and outputs the data optical signal output from the data optical transmission unit and the RF optical signal output from the RF optical transmission unit;
An optical transmission unit for transmitting an optical signal output from the multiplexing unit;
It has a plurality of output terminals, and the transmission characteristic at each output terminal is a periodicity (FSR: Free Spectral Range) that substantially matches the difference between the center wavelength of the first wavelength band and the center wavelength of the second wavelength band. ) And the data optical signal transmitted by the optical transmission unit is separated for each wavelength corresponding to each transmission destination, and the RF optical signal transmitted by the optical transmission unit is branched into a plurality of output terminals. An optical routing unit that outputs from the
An optical amplifying unit for amplifying the optical signal output from the optical routing unit;
An optical branching section for branching the optical signal amplified by the optical amplification section into a plurality of parts;
An optical receiving unit that receives the optical signal branched by the optical branching unit and separates and outputs the digital data signal and the carrier wave modulation signal based on the received optical signal;
An optical multiplex transmission apparatus, wherein relative magnitudes of powers of a data optical signal and an RF optical signal input to the optical amplifying unit are determined based on reception quality in the optical receiving unit.

The power of the RF optical signal input to the optical amplifying unit is large so that the temporal change (DG: Differential Gain) of the digital data signal output from the optical receiving unit is smaller than a predetermined value, and / or 2. The optical multiplex transmission apparatus according to claim 1, wherein power of a data optical signal input to the optical amplifying unit is controlled to be small.

A DG detector that detects a DG amount of a digital data signal output from the optical receiver;
A quality information transmission unit that transmits the DG amount detected by the DG detection unit to at least one of the data light transmission unit and the RF light transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on the amount of DG transmitted by the quality information transmission unit. Optical multiplex transmission equipment.

The power of the RF optical signal input to the optical amplifier is large and / or the data input to the optical amplifier so that the waveform distortion of the carrier wave modulation signal output from the optical receiver is smaller than a predetermined value. 2. The optical multiplex transmission apparatus according to claim 1, wherein power of the optical signal is controlled to be small.

A distortion detector that detects the amount of waveform distortion of the carrier wave modulation signal output from the optical receiver;
A quality information transmission unit that transmits the waveform distortion amount detected by the distortion detection unit to at least one of the data light transmission unit and the RF light transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of the optical signal to be output based on the waveform distortion amount transmitted by the quality information transmission unit. The optical multiplex transmission apparatus described.

The DG of the digital data signal output from the optical receiver is smaller than a first predetermined value, and the waveform distortion of the carrier modulation signal output from the optical receiver is smaller than a second predetermined value. 2. The optical multiplexing according to claim 1, wherein the power of the RF optical signal input to the optical amplifying unit is controlled to be large and / or the power of the data optical signal input to the optical amplifying unit is controlled to be small. Transmission equipment.

A reception quality detection unit for detecting a DG amount of the digital data signal output from the optical reception unit and a waveform distortion amount of the carrier wave modulation signal output from the optical reception unit;
A quality information transmission unit that transmits the DG amount and waveform distortion amount detected by the reception quality detection unit to at least one of the data light transmission unit and the RF light transmission unit;
At least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on the amount of DG and the amount of waveform distortion transmitted by the quality information transmission unit. Item 7. The optical multiplex transmission device according to Item 6.

The power of the RF optical signal input to the optical amplifier is small so that the signal to noise ratio (SNR) of the digital data signal output from the optical receiver is greater than a predetermined value; and 2. The optical multiplex transmission apparatus according to claim 1, wherein the power of the data optical signal input to the optical amplifying unit is largely controlled.

An SNR detector that detects an SNR amount of a digital data signal output from the optical receiver;
A quality information transmission unit that transmits the SNR amount detected by the SNR detection unit to at least one of the data optical transmission unit and the RF optical transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on an SNR amount transmitted by the quality information transmission unit. Optical multiplex transmission equipment.

Data input to the optical amplifier so that the SNR of the digital data signal output from the optical receiver is larger than a first predetermined value and the DG of the digital data signal is smaller than a second predetermined value. The optical multiplex transmission apparatus according to claim 1, wherein power of the optical signal and / or power of the RF optical signal input to the optical amplifying unit is controlled.

A digital signal quality detector for detecting the SNR amount and the DG amount of the digital data signal output from the optical receiver;
A quality information transmission unit that transmits the SNR amount and the DG amount detected by the digital signal quality detection unit to at least one of the data optical transmission unit and the RF optical transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on the SNR amount and the DG amount transmitted by the quality information transmission unit. The optical multiplex transmission apparatus according to 10.

The power of the RF optical signal input to the optical amplifier is small and / or the data optical signal input to the optical amplifier so that the power of the data optical signal received by the optical receiver is greater than a predetermined value. The optical multiplex transmission apparatus according to claim 1, wherein the power of the optical fiber is controlled largely.

An optical power detector for detecting the amount of power of the data optical signal received by the optical receiver;
A quality information transmission unit that transmits the amount of power detected by the optical power detection unit to at least one of the data optical transmission unit and the RF optical transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on the amount of power transmitted by the quality information transmission unit. Optical multiplex transmission equipment.

The optical signal so that the power of the data optical signal received by the optical receiver is greater than a first predetermined value and the DG of the digital data signal output from the optical receiver is smaller than a second predetermined value. The optical multiplex transmission apparatus according to claim 1, wherein the power of the data optical signal input to the amplifying unit and / or the power of the RF optical signal input to the optical amplifying unit are controlled.

An optical power detector for detecting the amount of power of the data optical signal received by the optical receiver;
A DG detector that detects a DG amount of a digital data signal output from the optical receiver;
A quality information transmission unit that transmits the amount of power detected by the optical power detection unit and the amount of DG detected by the DG detection unit to at least one of the data light transmission unit and the RF light transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on the amount of power and the amount of DG transmitted by the quality information transmission unit. 14. An optical multiplex transmission apparatus according to 14.

The power of the data optical signal input to the optical amplifier and / or the optical signal so that the bit error rate (BER) of the digital data signal output from the optical receiver is smaller than a predetermined value. 2. The optical multiplex transmission apparatus according to claim 1, wherein the power of the RF optical signal input to the amplifying unit is controlled.

A BER detector for detecting a BER amount of a digital data signal output from the optical receiver;
A quality information transmission unit that transmits the BER amount detected by the BER detection unit to at least one of the data optical transmission unit and the RF optical transmission unit;
The at least one of the data optical transmission unit and the RF optical transmission unit controls the power of an optical signal to be output based on the BER amount transmitted by the quality information transmission unit. Optical multiplex transmission equipment.

2. The optical multiplex transmission apparatus according to claim 1, wherein the data optical signal is an optical signal having a burst property that is generated intermittently.

The carrier modulation signal is a frequency obtained by modulating a plurality of carrier waves having different predetermined frequencies based on data corresponding to each carrier wave to obtain a plurality of modulation signals, and frequency-multiplexing the modulation signals. The optical multiplex transmission apparatus according to claim 1, wherein the optical multiplex transmission apparatus is a multiplexed signal.

The data optical signal is an optical signal having a burst property that is generated intermittently, and the carrier modulation signal is based on data corresponding to each of a plurality of carriers having predetermined different frequencies. 2. The optical multiplex transmission apparatus according to claim 1, wherein the optical multiplex transmission apparatus is a frequency multiplex signal obtained by performing modulation to obtain a plurality of modulation signals and frequency-multiplexing the modulation signals.

2. The optical multiplex transmission apparatus according to claim 1, wherein a bandwidth of the first wavelength band and a bandwidth of the second wavelength band substantially coincide with each other.

2. The optical multiplex transmission apparatus according to claim 1, wherein a bandwidth of the first wavelength band and / or a bandwidth of the second wavelength band is smaller than an FSR of the optical routing unit.

2. The optical multiplex transmission apparatus according to claim 1, wherein a bandwidth of the first wavelength band, a bandwidth of the second wavelength band, and an FSR of the optical routing unit substantially match.

2. The optical multiplex transmission apparatus according to claim 1, wherein the RF light transmission unit includes a plurality of light sources, and combines and outputs the output light of the light sources.