The NYC04D Series DML DFB Transmitter is a high-power, single-mode distributed feedback (DFB) laser diode transmitter designed for use in long-haul optical communication systems. It operates at a wavelength of 1550 nm and has a typical output power of 13 dBm. The transmitter is housed in a hermetically sealed package with a built-in optical isolator to protect it from back reflections.

The NYC04D Series DML DFB Transmitter works by using a distributed feedback laser diode to generate a continuous wave (CW) optical signal. The laser diode is made up of a semiconductor active region that is sandwiched between two gratings. The gratings provide feedback to the laser diode, which helps to stabilize the output wavelength and power.

The output of the laser diode is then coupled into a single-mode optical fiber using a fiber pigtail. The fiber pigtail is a short length of optical fiber that is attached to the laser diode package. The fiber pigtail helps to ensure that the optical signal is efficiently coupled into the optical fiber.

The NYC04D Series DML DFB Transmitter is a highly reliable and efficient transmitter that is well-suited for use in long-haul optical communication systems. It has a long operating life and requires very little maintenance.

Here is a more detailed explanation of the different components of the NYC04D Series DML DFB Transmitter:

· Distributed feedback (DFB) laser diode: The DFB laser diode is the active component of the transmitter. It is a semiconductor laser diode that is designed to produce a CW optical signal with a stable wavelength and power. The DFB laser diode is made up of a semiconductor active region that is sandwiched between two gratings. The gratings provide feedback to the laser diode, which helps to stabilize the output wavelength and power.

· Optical isolator: The optical isolator is a passive device that is used to protect the laser diode from back reflections. Back reflections can occur when the optical signal is reflected back into the laser diode from the optical fiber. This can cause the laser diode to oscillate at an unstable frequency and can also damage the laser diode.

· Fiber pigtail: The fiber pigtail is a short length of optical fiber that is attached to the laser diode package. The fiber pigtail helps to ensure that the optical signal is efficiently coupled into the optical fiber.

The NYC04D Series DML DFB Transmitter is a highly reliable and efficient transmitter that is well-suited for use in long-haul optical communication systems. It has a long operating life and requires very little maintenance.