| 摘要 |
<p>Digital modulation is extracted for regeneration using an optical coupler and clock extractor, and semiconductor amplifiers are used in an amplitude or phase modulator arrangement to modulate soliton pulses. The device comprises an optical coupler (C3) and electro-optical recovery unit (CLK) for recovery of the clock signal from the incoming signal in the input line (F1). This permits the extraction of digital information for regenerating use and a means of modulation of the amplitude and/or the phase of the solitons by the clock signal. The device is characterized by the use of a Mach-Zehnder modulator (MOD) containing first and second optical semiconductor amplifiers (SOA1, SOA2) arranged in two parallel arms (F5,F6) with the gain of each modulated by the recovered clock signal. The output signal from the recovery unit (CLK) are fed to a splitting circuit (DIV) providing, through delay circuits (DELCLK1,DELCLK2), feedback to amplifiers (SOA1,SOA2) in the modulator. The output line (F2) contains the signal of same wavelength as the input line, with the clock signals blocked by the feedback signals.</p> |
