A monolithically integrated optical modulation device comprising: a single substrate including a front edge, a rear edge, and a side edge; an input optical port ; an output optical port ; an optical waveguide for guiding light from the input optical port to the output optical port , wherein a portion of the optical waveguide is split into at least two branches , wherein the optical waveguide is configured to cause a net 180° change in direction of the light while guiding said light from the input optical port to the output optical port such that the input optical port and the output optical port are positioned on the front edge, and wherein at least some of the net 180° change in direction is achieved within the branches of the optical waveguide; an on-chip termination unit coupled to at least one branch of the at least two branches , the on-chip termination unit including a resistor , at least one direct current (DC) electrical input terminal , disposed on the side edge, that connects to at least one branch of the at least two branches ; and at least one electrical input terminal , disposed on the rear edge, for providing a radio frequency (RF) electrical signal to at least one branch of the at least two branches , the input optical port , the output optical port , the optical waveguide, and the on-chip termination unit , the at least one DC electrical input terminal , and the at least one electrical input terminal being monolithically integrated on the single substrate . a single substrate including a front edge, a rear edge, and a side edge; an input optical port ; an output optical port ; an optical waveguide for guiding light from the input optical port to the output optical port , wherein a portion of the optical waveguide is split into at least two branches , wherein the optical waveguide is configured to cause a net 180° change in direction of the light while guiding said light from the input optical port to the output optical port such that the input optical port and the output optical port are positioned on the front edge, and wherein at least some of the net 180° change in direction is achieved within the branches of the optical waveguide; wherein the optical waveguide is configured to cause a net 180° change in direction of the light while guiding said light from the input optical port to the output optical port such that the input optical port and the output optical port are positioned on the front edge, and wherein at least some of the net 180° change in direction is achieved within the branches of the optical waveguide; an on-chip termination unit coupled to at least one branch of the at least two branches , the on-chip termination unit including a resistor , at least one direct current (DC) electrical input terminal , disposed on the side edge, that connects to at least one branch of the at least two branches ; and at least one electrical input terminal , disposed on the rear edge, for providing a radio frequency (RF) electrical signal to at least one branch of the at least two branches , the input optical port , the output optical port , the optical waveguide, and the on-chip termination unit , the at least one DC electrical input terminal , and the at least one electrical input terminal being monolithically integrated on the single substrate . <EOS>