A directly modulated multi-section tunable laser

By designing a multi-segment tunable laser and employing reconstruction-equivalent chirp technology and feedback compensation region structure, the modulation bandwidth and wavelength accuracy problems of directly modulated lasers were solved, realizing a laser array with high-speed transmission and high output power.

CN114825037BActive Publication Date: 2026-01-16NANJING UNIV
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Patent Information

Application Number
CN202210365085.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-04-08
Publication Date
2026-01-16
Estimated Expiration
2042-04-08

AI Technical Summary

Technical Problem

Existing direct-modulated lasers have limited modulation bandwidth and low side-mode suppression, and the per-channel wavelength accuracy and output power requirements of tunable lasers fail to meet the demands of high-speed transmission.

Method used

Design a multi-segment tunable laser consisting of multiple laser units connected in series. Employ the reconstruction-equivalent chirp technique to design the sampling grating and feedback compensation region. Combine circular electrodes and an equivalent π phase shift structure to reduce the length of the active gain region and enhance single-mode output characteristics. In addition, integrate an optical amplifier at the front end of the array.

Benefits of technology

The modulation rate and single-mode output characteristics of the laser were improved, the side-mode rejection ratio was enhanced, the requirements of high-speed direct modulation and wavelength tunable function were met, and high output power and precise wavelength tuning were achieved.

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Abstract

The application discloses a kind of directly modulated multi-section tunable laser, which is composed of multiple laser units in series, both ends of the tunable laser are coated with anti-reflection film, the front end of the first laser unit is integrated with an optical amplifier, the sampling grating periods of adjacent laser units are different, and the lasing wavelength difference is 2-5 nm;The laser unit includes: a laser light-emitting active gain region and a feedback compensation region arranged before and after the laser light-emitting active gain region, the laser light-emitting active gain region is inserted with an equivalent π phase shift sampling grating structure through the reconfiguration-equivalent chirp technology, and the feedback compensation region adopts a uniform sampling grating period, which is different from the sampling period of the sampling grating structure of the laser light-emitting active gain region.This tunable laser is beneficial to improve the modulation rate of the laser and the single-mode output characteristics of the laser, and simultaneously cascades multiple distributed feedback laser units to realize wavelength tuning coverage.
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