Semiconductor optoelectronic waveguide

A semiconductor optoelectronic waveguide comprising:

• a set of n-type electrode layers having an upper n-type electrode layer and a lower n-type electrode layer;
• a semiconductor core layer arranged between said n-type electrode layers, the semiconductor core layer having electro-optical effects when a voltage is supplied between said n-type electrode layers, the electro-optical effects being used to modulate an optical signal;
• a first set of semiconductor layers having a first layer arranged between said upper n-type electrode layer and said core layer and a second layer arranged between said lower n-type electrode layer and said core layer;
• a second set of semiconductor layers having an upper layer arranged between said first layer and said core layer and a lower layer arranged between said core layer and said second layer;
• and
• a pn junction including:
• a p-type layer arranged between said upper n-type electrode layer and said first layer;
• and
• an n-type layer arranged between said upper n-type electrode layer and said p-type layer,
• wherein band gaps of said second set of semiconductor layers are greater than the band gap of said core layer, and band gaps of said first set of semiconductor layers are greater than the band gaps of the second set of semiconductor layers.