Abstract

We demonstrate a broadband wavelength shifter/signal invertor using a grating-controlled external cavity semiconductor laser. The shifter makes use of the gain saturation of laser diodes and does not require probe laser as demonstrated for the case of semiconductor optical amplifier.¹ Furthermore, the wavelength selection done by mechanical control of the grating gives great flexibility in wavelength selection for wavelength division multiplexing. Several types of wavelength shifters have been reported,^2–4 but none of them are capable of direct generation and control of wavelength shifted output.

© 1995 IEEE