OPTICAL TRANSMITTER AND OPTICAL TRANSMITTER CONTROL METHOD

• Main Authors: MIYAMOTO YUTAKA, YUBE MASAO, SATO NORIFUMI, HIRANO AKIRA, YONENAGA KAZUSHIGE
• Format: Patent
• Language: English
• Published: 07.12.2001
• Edition: 7
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FREQUENCY-CHANGING; MULTIPLEX COMMUNICATION; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To provide a stable optical transmitter that is highly immune to dispersion in a group velocity of an optical fiber and that hardly deteriorates in the receiving sensitivity and may not be affected by the dispersion in the group velocity for the extension of the network scale. SOLUTION: The optical transmitter consists of a light source section that generates an optical clock pulse synchronously with a signal bit rate at a prescribed duty ratio and that variably sets the duty ratio of the optical clock pulse and a coding section that sets a relative optical phase difference between optical clock pulses in adjacent time slots to an odd number multiple of πin order to encode the optical clock pulse by an electric signal in synchronism with the optical clock pulse.