Abstract
Rayleigh speckle with random jagged pattern resulting from the interference of Rayleigh backscattering lightwave in a single-mode fiber contains the wavelength information of the incident lightwave. We propose an all-fiber wavemeter based on the relation between Rayleigh speckle and wavelength. The system does not suffer from the resolution-bandwidth trade-off relation and simultaneously achieves an ultra-high resolution of 40 attometers and a broad bandwidth of 80 nm covering 1520 to 1600 nm. The wavemeter could enable precise measurement of continuous-wave optical waveforms at time resolution of 100
$\mu$
s. Combined with a dynamic laser, the system can be regarded as a high-resolution spectroscopy for absorption spectrum analysis. To demonstrate the broad applicability of the techinique, we use a laser step-scanned over 80 nm to measure the spectral response of hydrogen cyanide absorption line, and use a continuous-wave laser to measure its nonlinear wavelength scan over 1 nm. The proposed all-fiber wavemeter provides great prospects for ultra-precise spectrum analysis with ultra-broad bandwidth and ultra-high resolution.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription
Add to BibSonomy