Systems and methods of monitoring optical transmitter signals are described.
In one aspect, an optical transmitter system includes a feedback block, an optical
substrate, a source of input light within an operative wavelength range, and a
detector. The feedback block is substantially transparent to light within the operative
wavelength range and includes an optical fiber side having a light output and one
or more reflectors, and an optical substrate side. The optical substrate is substantially
transparent to light within the operative wavelength range. The optical substrate
includes a device side having a light input, and a feedback block side that is
coupled to the optical substrate side of the feedback block. The feedback block
side has a splitter that is operable to split light that is received from the device
side light input into an output beam that is directed toward the light output of
the feedback block and a light sample that is directed toward a feedback block
reflector. The source of input light is mounted to the device side of the optical
substrate and is aligned for light transmission through the device side light input
to the splitter. The detector is mounted to the device side of the optical substrate
and is aligned for detection of a light sample that is transmitted from a feedback
block reflector and through the feedback block and the optical substrate.
