18252931. Optical Transmitter simplified abstract (Nippon Telegraph and Telephone Corporation)

Optical Transmitter

Organization Name

Nippon Telegraph and Telephone Corporation

Inventor(s)

Meishin Chin of Musashino-shi, Tokyo (JP)

Shigeru Kanazawa of Musashino-shi, Tokyo (JP)

Takahiko Shindo of Musashino-shi, Tokyo (JP)

Optical Transmitter - A simplified explanation of the abstract

This abstract first appeared for US patent application 18252931 titled 'Optical Transmitter

Simplified Explanation

The present disclosure describes an optical transmitter that integrates a DFB laser, an EA modulator, and SOAs (semiconductor optical amplifiers) on a single substrate. The EA modulator produces intensity-modulated light, which is then optically amplified in the parallelized SOAs.

• The optical transmitter integrates a DFB laser, an EA modulator, and SOAs on a single substrate.
• The EA modulator generates intensity-modulated light.
• The parallelized SOAs include a first MMI (multimode interference) that splits the intensity-modulated light into multiple optical paths.
• Corresponding SOAs optically amplify the split light.
• A second MMI combines the optically amplified lights.
• The parallelized SOAs allow for higher output power and improved waveform quality.
• The total SOA injection current is the same as that of a conventional optical transmitter with a single SOA.

Potential Applications

• Optical communication systems
• Fiber optic networks
• Data transmission in telecommunication industry

Problems Solved

• Limited output power and waveform quality in conventional optical transmitters
• Integration of multiple components on a single substrate

Benefits

• Higher output power
• Improved waveform quality
• Simplified integration of components
• Cost-effective solution for optical communication systems

Original Abstract Submitted

An optical transmitter of the present disclosure is obtained by integrating a DFB laser, an EA modulator, and SOAs, and intensity-modulated light from the EA modulator is optically amplified in the parallelized SOAs. The parallelized SOAs include a first MMI that splits the intensity-modulated light from the EA modulator toward two or more optical paths, corresponding SOAs that optically amplify the split light, and a second MMI that combines the optically amplified lights. The components of the optical transmitter are integrated on a single substrate. In the parallelized SOAs, it is possible to obtain a higher output power and an improved waveform quality, by applying a total SOA injection current that is the same as that of an optical transmitter of a conventional technology including a single SOA.