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Improved Range Tunability of DFB Lasers Based on REC Technique Under Injection Current

Multi-wavelength distributed feedback laser array (DFB-MLA) based tunable semiconductor lasers have been widely used owing to the high mode stability and simple wavelength tuning scheme. In this paper, we proposed and experimentally demonstrated a matrix-grating tunable DFB laser array. And the reconstruction-equivalent-chirp (REC) technique is utilized to simplify grating fabrication and realize precise control of the grating phase. Traditionally, the laser is tuned by thermal-electric cooler (TEC), with large power consumption, slow wavelength tuning capability, and added device. To improve the wavelength tuning speed of laser, we varied laser's injection current instead of adjusting TEC's temperature. In addition, we analyzed the thermal influence of submount on the laser and then chose the SiO 2 as the submount material for its low thermal conductivity and poor heat dissipation, resulting in wide wavelength tuning range via injection current. The DFB-MLA chip achieves a better tunable effect as the lasers can be tuned at 3.5-3.7 nm per channel from 50 to 120 mA with stable output power of over 3 mw as contrasted with the laser on the AlN submount being tuned at 1.4-1.5 nm per channel. And the chip has a side-mode suppressing ratio (SMSR) of over 35 dB and strong stability of wavelength in the repeated experiments. The proposed method may give a new way to realize the wide tuning range tunable DFB laser with a simple wavelength tuning mechanism in the future, especially for the applications of uncooled low-cost tunable lasers.

Ketersediaan

Informasi Detail

Judul Seri

IEEE JOURNAL OF QUANTUM ELECTRONICS; Vol.57 No.2 April 2021

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 2200107

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

TUNABLE LASER
LOW HEAT CONDUCTIVITY SUBMOUNT
WIDE TUNING RANGE
REC TECHNIQUE

Info Detail Spesifik

DOI: 10.1109/JQE.2021.3051426

Pernyataan Tanggungjawab

Ke Xu, Pan Dai, Zhenxing Sun, Jun Lu, Rulei Xiao, Zhirui Su, Tao Fang, Yuechun Shi, Xiangfei Chen

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