Abstract
We propose and implement a tunable, high power and narrow linewidth laser source based on a series of highly coherent tones from an electro-optic frequency comb and a set of 3 DFB slave lasers. We experimentally demonstrate approximately 1.25 THz (10 nm) of tuning within the C-Band centered at 192.9 THz (1555 nm). The output power is approximately 100 mW (20 dBm), with a side band suppression ratio greater than 55 dB and a linewidth below 400 Hz across the full range of tunability. This approach is scalable and may be extended to cover a significantly broader optical spectral range.
Highlights
A single-line, highly tunable, low linewidth, and high power source is highly desirable for applications such as spectroscopy, interferometry, and metrology [1,2,3,4], as well in communications [5,6,7,8,9]
We have implemented a system based on a commercial high coherence fiber laser, an electro-optic (EO) frequency comb, and an array of 3 commercially available distributed feedback lasers (DFB) slave lasers which are used for injection locking of individual comb teeth
The principle of operation is seen in Fig. 1(A), an NKT Koheras fiber laser is used to produce an electro-optic frequency comb, after which a tone is selected using a programmable optical filter and used as the master field for injection locking one of a set of subsequent Gooch and Housego high power DFB slave laser
Summary
A single-line, highly tunable, low linewidth, and high power source is highly desirable for applications such as spectroscopy, interferometry, and metrology [1,2,3,4], as well in communications [5,6,7,8,9]. Approaches to achieve this end range from semiconductor distributed feedback lasers (DFB) [12,13,14,15] and distributed Bragg reflector (DBR) lasers [16,17,18,19,20], to fiber-based ring lasers [1,21,22,23,24,25,26] While these single frequency devices may produce high power and a low linewidth, their tunability is typically low, on the order of a few nanometers. Frequency combs operate on a fixed grid and their power is distributed among many lines, which means that the OSNR of each tone after amplification is typically very low To overcome these limitation, we have implemented a system based on a commercial high coherence fiber laser, an electro-optic (EO) frequency comb, and an array of 3 commercially available DFB slave lasers which are used for injection locking of individual comb teeth. To further increase the achievable frequency range, the approach may be upscaled via the use of additional slave lasers and the use of a broader comb source
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