the attachment here shows an Add drop function using Fiber bragg grating..when i transmit data, the signal shows fine upto circulator..i mean whatever wavelengths i transmit all are present..but after the circulator i use bidirectional fiber to transmit these wavelengths and receive the corresponding wavelength …but when i check my signal after bidirectional fiber, there is no signal response..Please can someone help me in finding whats wrong or if i am doing something wrong..! i would appreciate the responses
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