[1] G. Levesque (EXFO), Photonics Spectra 34, 106 (2000).
[2] S. V. Kartalopoulos, DWDM: Networks, Devices, and Technology (Wiley-IEEE Press, 2002).
[3] K. R. Wildnauer and Z. Azary, Hewlett-Packard Journal 44, 68 (1993).
[4] Yokogawa Electronic Corporation (Japan), "Optical spectrum analyser and spectroscope" International Patent Number WO9628713A1 (1996).
[5] Oxford Fibre Optics Tools Ltd. (UK), "Optical spectrum analyser" International Patent Application Number PCT/GB00/00496 (1999).
[6] T. D. Liao and R. Chaney, "Wavelength tuning in external cavity lasers" International Patent WO 01/73905 (October 4, 2001).