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Linewidth measurements of MEMS-based tunable lasers for phase-locking applications

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4 Author(s)
Ip, E. ; Dept. of Electr. Eng., Stanford Univ., CA, USA ; Kahn, J.M. ; Anthon, D. ; Hutchins, J.

We have used two techniques - the beat spectrum method and the frequency noise spectrum method - to measure linewidths of microelectromechanical systems (MEMS)-based tunable external cavity lasers (ECLs) in the C-band (1527-1567 nm). The two techniques yield similar results, but the latter is able to measure narrow linewidths more accurately in the presence of frequency jitter. The MEMS-based ECL linewidths are found to be inversely proportional to output powers over a wide range of powers. At output powers of 12 dBm, the beat linewidth is no more than 30 kHz, corresponding to per-laser linewidths of about 15 kHz. We show that these lasers are suitable for coherent detection of quadrature phase-shift keying.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 10 )

Date of Publication:

Oct. 2005

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