Abstract: An opto-electronic system including a PIC that includes a semiconductor-based tunable laser source that can achieve single-mode lasing thereby emitting optical radiation having a predefined linewidth at a predefined operating wavelength. The PIC also includes an optical measurement unit that can receive the optical radiation emitted by said laser source, and provide a signal representative for the received optical radiation to a control unit of the opto-electronic system that is operatively connected with said laser source and the optical measurement unit. The opto-electronic system enables omitting external optical measurement equipment thereby enabling a faster and cheaper way of locking of the predefined operating wavelength of said laser and achieving the predefined linewidth. A method of improved tuning of a semiconductor-based tunable laser source of an opto-electronic system.

Abstract: An optical transmitter that includes a wavelength tunable laser diode (LD) with a narrowed emission linewidth is disclosed. The optical transmitter further includes a feedback unit and an optical attenuator. The feedback unit, receiving a portion of laser light of the wavelength tunable LD, generates feedback light by rotating the polarization of the laser light by 90±5°, and returns thus generated feedback light in the wavelength tunable LD. The optical attenuator adjusts power of the feedback light to reduce a line wide of the laser light, or frequency noises thereof.

Abstract: An optical transmitter that includes a wavelength tunable laser diode (LD) with a narrowed emission linewidth is disclosed. The optical transmitter further includes a feedback unit and an optical attenuator. The feedback unit, receiving a portion of laser light of the wavelength tunable LD, generates feedback light by rotating the polarization of the laser light by 90±5°, and returns thus generated feedback light in the wavelength tunable LD. The optical attenuator adjusts power of the feedback light to reduce a line wide of the laser light, or frequency noises thereof.